Pub Date : 2023-09-30DOI: 10.31320/jksct.2023.25.2.5
Jong-Tae Yoon, Deuk-Yong Kim, Ki Baek Lee
With the development of various reconstruction algorithms for CT imaging, it has become possible to perform low-dose CT examinations without compromising image quality. However, quantitative evaluation such as image noise, signal-to-noise ratio (SNR), and contrast-tonoise ratio (CNR) have been mainly used yet, while the spatial resolution and overall image quality rely on subjective assessment. Therefore, this study aimed to propose a quantitative method for evaluating spatial resolution in chest and abdominal CT scans, in order to facilitate dose reduction. For this study, a phantom was fabricated using 3D printing and scanned under chest and abdominal imaging conditions, with additional scans performed under low-dose conditions. The peak, bottom, FWHM, DFWHM, and peak-bottom were compared and analyzed. The results showed no statistically significant differences in spatial resolution parameters between all chest and abdominal protocol, with FWHM and DFWHM indicating the same distance. Even if the dose is reduced to 30 mAs in the chest CT condition and to 50 mAs in the abdominal CT condition, there will not be a big problem in terms of spatial resolution. Lastly, the indices from this study demonstrate potential as objective measures of spatial resolution when applying low-dose CT protocols.
{"title":"Establishment of Radiation Dose Reduction Criteria for Thoracic and Abdominal CT via Systematic Spatial Resolution Evaluation","authors":"Jong-Tae Yoon, Deuk-Yong Kim, Ki Baek Lee","doi":"10.31320/jksct.2023.25.2.5","DOIUrl":"https://doi.org/10.31320/jksct.2023.25.2.5","url":null,"abstract":"With the development of various reconstruction algorithms for CT imaging, it has become possible to perform low-dose CT examinations without compromising image quality. However, quantitative evaluation such as image noise, signal-to-noise ratio (SNR), and contrast-tonoise ratio (CNR) have been mainly used yet, while the spatial resolution and overall image quality rely on subjective assessment. Therefore, this study aimed to propose a quantitative method for evaluating spatial resolution in chest and abdominal CT scans, in order to facilitate dose reduction. For this study, a phantom was fabricated using 3D printing and scanned under chest and abdominal imaging conditions, with additional scans performed under low-dose conditions. The peak, bottom, FWHM, DFWHM, and peak-bottom were compared and analyzed. The results showed no statistically significant differences in spatial resolution parameters between all chest and abdominal protocol, with FWHM and DFWHM indicating the same distance. Even if the dose is reduced to 30 mAs in the chest CT condition and to 50 mAs in the abdominal CT condition, there will not be a big problem in terms of spatial resolution. Lastly, the indices from this study demonstrate potential as objective measures of spatial resolution when applying low-dose CT protocols.","PeriodicalId":487528,"journal":{"name":"대한CT영상기술학회지","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135082656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-30DOI: 10.31320/jksct.2023.25.2.25
Dong-Chan Sung, Dong-Gyu Song, Sang-Hun Kim, Chun-Bong Son
In order to obtain proper expansion of the bladder and a homogeneous EP image from the excretory image of CT urography, we urinated after UP images obtained EP images after 7 min and 14 min and compared them with EP images of the existing method to find usefulness. The subjects of the study were 90 patients who visited our hospital and CTU using furosemide and 30 patients were divided into the existing method (Group A), 7 min EP (Group B) after urination and 14 min EP (Group C) after urination. Through the Image J function, the bladder volume of each group's UP image and EP image was measured and the average CT number and standard deviation of the bladder's anterior and posterior were measured with an ROI of 30 ㎟ in diameter. As a result the bladder volume of each group increased by 75.07%, 23.98%, and 50.31%, respectively in EP images compared to UP images. The CT number of the bladder anterior and posterior was measured to be relatively higher in group B and group C than in group A. The Gap of anterior and posterior CT number of bladder was the largest in group A at 53.06 ± 0.12 HU and group B and group C were measured 71.95% and 71.61% lower than group A. In conclusion, the method of urinating after injecting diuretics and obtaining EP images after 7 min during CTU helps to obtain proper expansion of the bladder and homogeneous images in the bladder, and is considered to be of great help in diagnosis.
为了从CT尿路造影的排泄图像中获得膀胱适当的扩张和均匀的EP图像，我们在尿后7分钟和14分钟的UP图像中获得EP图像，并将其与现有方法的EP图像进行比较，以寻找有用的方法。本研究以90例使用速尿来我院及CTU就诊的患者为研究对象，将30例患者分为现有方法(A组)、排尿后7 min EP (B组)和排尿后14 min EP (C组)。通过Image J函数测量各组UP图像和EP图像的膀胱体积，测量膀胱前后位的平均CT数和标准差，ROI为直径30毫米。结果两组膀胱体积在EP图像上较UP图像分别增大75.07%、23.98%和50.31%。B组和C组膀胱前后位CT数相对高于A组，A组膀胱前后位CT数差距最大，为53.06±0.12 HU, B组和C组膀胱前后位CT数差距分别比A组小71.95%和71.61%。注射利尿剂后排尿，在CTU中7 min后获得EP图像的方法有助于获得膀胱的适当扩张和膀胱内均匀的图像，认为对诊断有很大帮助。
{"title":"A Study on the Optimization of Excretory Imaging in CT Urography","authors":"Dong-Chan Sung, Dong-Gyu Song, Sang-Hun Kim, Chun-Bong Son","doi":"10.31320/jksct.2023.25.2.25","DOIUrl":"https://doi.org/10.31320/jksct.2023.25.2.25","url":null,"abstract":"In order to obtain proper expansion of the bladder and a homogeneous EP image from the excretory image of CT urography, we urinated after UP images obtained EP images after 7 min and 14 min and compared them with EP images of the existing method to find usefulness. The subjects of the study were 90 patients who visited our hospital and CTU using furosemide and 30 patients were divided into the existing method (Group A), 7 min EP (Group B) after urination and 14 min EP (Group C) after urination. Through the Image J function, the bladder volume of each group's UP image and EP image was measured and the average CT number and standard deviation of the bladder's anterior and posterior were measured with an ROI of 30 ㎟ in diameter. As a result the bladder volume of each group increased by 75.07%, 23.98%, and 50.31%, respectively in EP images compared to UP images. The CT number of the bladder anterior and posterior was measured to be relatively higher in group B and group C than in group A. The Gap of anterior and posterior CT number of bladder was the largest in group A at 53.06 ± 0.12 HU and group B and group C were measured 71.95% and 71.61% lower than group A. In conclusion, the method of urinating after injecting diuretics and obtaining EP images after 7 min during CTU helps to obtain proper expansion of the bladder and homogeneous images in the bladder, and is considered to be of great help in diagnosis.","PeriodicalId":487528,"journal":{"name":"대한CT영상기술학회지","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135082668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-30DOI: 10.31320/jksct.2023.25.2.31
Soon-hwa Kim, Sung-ok Kwon, Ki Baek Lee
This study was to reduce the radiation exposure dose of recipients by setting the ECG window acquisition range appropriately during Coronary artery CT Angiography (CCTA) examination. Group 1 (control group) opened ECG window acquisition range to 65% to 75% using the relative delay scan (RDS), which is divided by percentage (%) based on the R-R peak interval of recipient's Average HR, and tested by setting pitch to auto. Group 2 fixed the pitch according to the recipient's HR under the same conditions as Group 1. Group 3 used absolute delay scan (ADS), which is divided by milliseconds (ms) based on the R-R peak interval of recipient's Average HR and fixed the ECG window acquisition range by 60 ms intervals. Group 4 narrowed the scan range from 68% to 73% under the same conditions as Group 1. The values of the mean, minimum, maximum, the volume CT dose index (CTDIvol), and dose length product (DLP) were compared. The exposure dose was reduced by more than 10% when acquired with ADS, not RDS mainly obtained from CCTA. Also, compared to the existing RDS, when the scan range was reduced by half, it was reduced by more than 20%. In conclusion, In CCTA testing, setting the ECG window acquisition range to 5% or 60 ms can reduce radiation exposure without compromising the best phase image acquisition and image quality.
{"title":"Radiation Exposure Dose Reduction according to ECG Window Acquisition Range Setting in Coronary Artery CT Angiography","authors":"Soon-hwa Kim, Sung-ok Kwon, Ki Baek Lee","doi":"10.31320/jksct.2023.25.2.31","DOIUrl":"https://doi.org/10.31320/jksct.2023.25.2.31","url":null,"abstract":"This study was to reduce the radiation exposure dose of recipients by setting the ECG window acquisition range appropriately during Coronary artery CT Angiography (CCTA) examination. Group 1 (control group) opened ECG window acquisition range to 65% to 75% using the relative delay scan (RDS), which is divided by percentage (%) based on the R-R peak interval of recipient's Average HR, and tested by setting pitch to auto. Group 2 fixed the pitch according to the recipient's HR under the same conditions as Group 1. Group 3 used absolute delay scan (ADS), which is divided by milliseconds (ms) based on the R-R peak interval of recipient's Average HR and fixed the ECG window acquisition range by 60 ms intervals. Group 4 narrowed the scan range from 68% to 73% under the same conditions as Group 1. The values of the mean, minimum, maximum, the volume CT dose index (CTDIvol), and dose length product (DLP) were compared. The exposure dose was reduced by more than 10% when acquired with ADS, not RDS mainly obtained from CCTA. Also, compared to the existing RDS, when the scan range was reduced by half, it was reduced by more than 20%. In conclusion, In CCTA testing, setting the ECG window acquisition range to 5% or 60 ms can reduce radiation exposure without compromising the best phase image acquisition and image quality.","PeriodicalId":487528,"journal":{"name":"대한CT영상기술학회지","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135082923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-30DOI: 10.31320/jksct.2023.25.2.69
Hyo-Seo Kim, Sung-Kwan Kim, Jang-Woo Jo, Eun-Hee Seo, Chang-Min Dae, Hee-Chang Chae
To study the usefulness of quantitative analysis using the relative electron density-based image in the diagnosis of subsolid nodule by chest high-resolution CT. The phantom study measured the CT number(HU), relative electron density(%EDW) and maximum diameter of the nodules by placing artificial nodules in the chest phantom. The patient study was conducted on 172 patients with subsolid nodules from April 2022 to January 2023. The volume and diameter of subsolid nodules in the CT number-based image and relative electron density-based image were measured separately after dividing the two groups: mixed ground-glass nodule and pure ground-glass nodule. The correlation studied between measuring the CT number(HU) and relative electron density(%EDW) by setting the region of interest. The CT number(HU) and diameter values in the phantom study were not significantly different from the actual values of the artificial nodules.(P>0.05) As a result of the patient study, the volume and diameter of subsolid nodules were increased in the relative electron density-based image compared to the CT number-based image for both the mixed ground-glass nodule and pure ground-glass nodule groups.(P<0.05) The CT number(HU) and relative electron density(%EDW) showed a strong positive correlation in both the phantom and patient study.(P<0.05) Providing visual imaging information using CT number-based and relative electron density-based images simultaneously can offer many advantages in establishing future treatment plans through accurate quantitative analysis of subsolid nodules.
{"title":"Usefulness of Quantitative Analysis Using Relative Electron Density-Based Image of Subsolid Nodule in Chest HRCT","authors":"Hyo-Seo Kim, Sung-Kwan Kim, Jang-Woo Jo, Eun-Hee Seo, Chang-Min Dae, Hee-Chang Chae","doi":"10.31320/jksct.2023.25.2.69","DOIUrl":"https://doi.org/10.31320/jksct.2023.25.2.69","url":null,"abstract":"To study the usefulness of quantitative analysis using the relative electron density-based image in the diagnosis of subsolid nodule by chest high-resolution CT. The phantom study measured the CT number(HU), relative electron density(%EDW) and maximum diameter of the nodules by placing artificial nodules in the chest phantom. The patient study was conducted on 172 patients with subsolid nodules from April 2022 to January 2023. The volume and diameter of subsolid nodules in the CT number-based image and relative electron density-based image were measured separately after dividing the two groups: mixed ground-glass nodule and pure ground-glass nodule. The correlation studied between measuring the CT number(HU) and relative electron density(%EDW) by setting the region of interest. The CT number(HU) and diameter values in the phantom study were not significantly different from the actual values of the artificial nodules.(P>0.05) As a result of the patient study, the volume and diameter of subsolid nodules were increased in the relative electron density-based image compared to the CT number-based image for both the mixed ground-glass nodule and pure ground-glass nodule groups.(P<0.05) The CT number(HU) and relative electron density(%EDW) showed a strong positive correlation in both the phantom and patient study.(P<0.05) Providing visual imaging information using CT number-based and relative electron density-based images simultaneously can offer many advantages in establishing future treatment plans through accurate quantitative analysis of subsolid nodules.","PeriodicalId":487528,"journal":{"name":"대한CT영상기술학회지","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135083197","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-30DOI: 10.31320/jksct.2023.25.2.49
Yoon-Yeong Jung, Ji-Na Shim, Ryeong-Hee Kim, Chi-Bok An, Se-Yeong Kim
This study conducted a quantitative and qualitative assessment of the effectiveness of Single-Energy and Dual-Energy Virtual non-calcium imaging, as well as Virtual Monoenergetic Imaging at 55, 65, and 75 keV, for diagnosing ligament conditions with regard to tube voltage modulation. A porcine hindlimb ankle ligament model was utilized for this evaluation. The two widest regions within the ligament model were designated as regions of interest, and measurements of Hounsfield Units, Signal-to-Noise Ratios, and Contrast-to-Noise Ratios were obtained. Quantitative evaluation was then conducted based on the average values. Furthermore, qualitative assessments of ligament diagnosis were carried out by five musculoskeletal radiologists and five radiological technologists, each with over five years of experience in Computed Tomography laboratory work. Following both quantitative and qualitative evaluations, it was observed that the Dual-Energy Virtual non-calcium image obtained at 70/Sn150 kVp and the Virtual Monoenergetic Imaging Plus 65 keV image exhibited superior image quality compared to the Single-Energy CT image. These differences were statistically significant (p<0.05). Moreover, the highest image quality was noted at 65 keV within the Virtual Monoenergetic Imaging Plus energy range. The Dual-Energy Virtual non-calcium image was found to be more suitable for imaging ligaments than the Virtual Monoenergetic Imaging Plus 65 keV image.(p<0.05) Notably, lower tube voltages were associated with improved image quality across all images. Consequently, it was determined that 70/Sn150 kVp Dual-Energy Virtual non-calcium images are more optimized than Single-Energy CT and Virtual Monoenergetic Imaging Plus 65 keV images for diagnosing ligament diseases in patients who present challenges for Magnetic Resonance Imaging and in emergency cases. Additionally, employing Virtual non-calcium Color Coding images for accurately describing ligament thickness or length may enhance the diagnostic value of the images.
{"title":"A Study on the Comparison of VNCa and VMI+ Image Quality and Optimized Method according to kV Modulation of DECT: A Porcine Ankle Ligament Model","authors":"Yoon-Yeong Jung, Ji-Na Shim, Ryeong-Hee Kim, Chi-Bok An, Se-Yeong Kim","doi":"10.31320/jksct.2023.25.2.49","DOIUrl":"https://doi.org/10.31320/jksct.2023.25.2.49","url":null,"abstract":"This study conducted a quantitative and qualitative assessment of the effectiveness of Single-Energy and Dual-Energy Virtual non-calcium imaging, as well as Virtual Monoenergetic Imaging at 55, 65, and 75 keV, for diagnosing ligament conditions with regard to tube voltage modulation. A porcine hindlimb ankle ligament model was utilized for this evaluation. The two widest regions within the ligament model were designated as regions of interest, and measurements of Hounsfield Units, Signal-to-Noise Ratios, and Contrast-to-Noise Ratios were obtained. Quantitative evaluation was then conducted based on the average values. Furthermore, qualitative assessments of ligament diagnosis were carried out by five musculoskeletal radiologists and five radiological technologists, each with over five years of experience in Computed Tomography laboratory work. Following both quantitative and qualitative evaluations, it was observed that the Dual-Energy Virtual non-calcium image obtained at 70/Sn150 kVp and the Virtual Monoenergetic Imaging Plus 65 keV image exhibited superior image quality compared to the Single-Energy CT image. These differences were statistically significant (p<0.05). Moreover, the highest image quality was noted at 65 keV within the Virtual Monoenergetic Imaging Plus energy range. The Dual-Energy Virtual non-calcium image was found to be more suitable for imaging ligaments than the Virtual Monoenergetic Imaging Plus 65 keV image.(p<0.05) Notably, lower tube voltages were associated with improved image quality across all images. Consequently, it was determined that 70/Sn150 kVp Dual-Energy Virtual non-calcium images are more optimized than Single-Energy CT and Virtual Monoenergetic Imaging Plus 65 keV images for diagnosing ligament diseases in patients who present challenges for Magnetic Resonance Imaging and in emergency cases. Additionally, employing Virtual non-calcium Color Coding images for accurately describing ligament thickness or length may enhance the diagnostic value of the images.","PeriodicalId":487528,"journal":{"name":"대한CT영상기술학회지","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135082918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-30DOI: 10.31320/jksct.2023.25.2.15
Min-Cheol Song, Tae-Eun Kim, Hee-Chang Chae, Choong-Beom Seo, Eun-Hee Seo, Chang-Min Dae
The purpose of this study was to minimize the undersizing of aortic annulus size and reduce complications by analysis the size change of aortic annulus during the cardiac cycle in patients with hypertrophic cardiomyopathy. Patients were prospectively underwent an ECG-gated TAVI Planning CT. Retrospective study was conducted 41 normal group (78.92 ± 12.6 years; 44% males) and 31 hypertrophic cardiomyopathy group (74.92 ± 10.8 years; 61% males). The annulus plane was identified on reconstructions at 10% intervals of the cardiac cycle. Based on semi-automatically defined Aortic annulus, area, perimeter, effective diameter, area-derived diameter, perimeter-derived diameter were measured. The area, perimeter, effective diameter, area-derived diameter and perimeterderived diameter were significantly changes during the cardiac cycle with a relative change of 27.3%, 10.4%, 11.9%, 12.6% and 11.1% respectively. (all p < 0.001) During the cardiac cycles of groups normal and Hypertrophic myopathy, aortic annulus showed different dynamic changes. Different group showed a significant difference in the maximum values distribution plot. (p < 0.05) In patients with hypertrophic cardiomyopathy, reconstructing the entire cardiac cycle and selecting the largest annulus to TAVI planning is considered to contribute greatly to the accurate selection of the size of prosthesis in the procedure and minimizing TAVI complications.
{"title":"Assessment of Aortic Annulus Dimensions for Patients with Hypertrophic Cardiomyopathy in Pre-TAVI Planning CT","authors":"Min-Cheol Song, Tae-Eun Kim, Hee-Chang Chae, Choong-Beom Seo, Eun-Hee Seo, Chang-Min Dae","doi":"10.31320/jksct.2023.25.2.15","DOIUrl":"https://doi.org/10.31320/jksct.2023.25.2.15","url":null,"abstract":"The purpose of this study was to minimize the undersizing of aortic annulus size and reduce complications by analysis the size change of aortic annulus during the cardiac cycle in patients with hypertrophic cardiomyopathy. Patients were prospectively underwent an ECG-gated TAVI Planning CT. Retrospective study was conducted 41 normal group (78.92 ± 12.6 years; 44% males) and 31 hypertrophic cardiomyopathy group (74.92 ± 10.8 years; 61% males). The annulus plane was identified on reconstructions at 10% intervals of the cardiac cycle. Based on semi-automatically defined Aortic annulus, area, perimeter, effective diameter, area-derived diameter, perimeter-derived diameter were measured. The area, perimeter, effective diameter, area-derived diameter and perimeterderived diameter were significantly changes during the cardiac cycle with a relative change of 27.3%, 10.4%, 11.9%, 12.6% and 11.1% respectively. (all p < 0.001) During the cardiac cycles of groups normal and Hypertrophic myopathy, aortic annulus showed different dynamic changes. Different group showed a significant difference in the maximum values distribution plot. (p < 0.05) In patients with hypertrophic cardiomyopathy, reconstructing the entire cardiac cycle and selecting the largest annulus to TAVI planning is considered to contribute greatly to the accurate selection of the size of prosthesis in the procedure and minimizing TAVI complications.","PeriodicalId":487528,"journal":{"name":"대한CT영상기술학회지","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135083400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-30DOI: 10.31320/jksct.2023.25.2.61
In-Uk Lee, Jae-Seong Choi, Seon-Pyo Lee, Hyeon-Seong Lee
During the brain computed tomography angiography (Brain CTA) test of hemorrhagic stroke patients, we tried to find out the test method for optimizing contrast enhancement of cerebrovascular vessels by changing the location of the region of interest (ROI) and scan delay time. From September 2022 to February 2023, 80 patients who visited the emergency room and performed a Brain CTA test were tested, and 10 people in control group without disease were ROI set at C3 to C4 level and performed a test by 6-second delay scan as soon as contrast enhancement was performed on common carotid artery (CCA) with the naked eye. 40 people in the hemorrhagic stroke experiment group A setting the same test method as the control group were tested after A-0; 6 second, A-1; 8 second, A-2; 10 second, A-3; 12-second delay for 10 people each, and 30 people in experiment group B setting ROI at circle of willis level and as soon as contrast enhancement was performed in the middle cerebral artery (MCA) were tested after B-1; 2 second, B-2; 4 second, B-3; 6-second delay for 10 people each. The evaluation methods include quantitative evaluation that compares and analyzes the mean HU values and percentage values of internal carotid artery (ICA), MCA, superior sagittal sinus (SSS), and internal jugular vein (IJV) of the control group and experimental groups A and B, qualitative evaluation through reconstructed images, and significance evaluation was conducted using an independent sample t-test. As a result of the quantitative evaluation, the mean HU value of MCA in the experimental group was measured lower than that of the control group, 369 HU, but was generally close to 300 HU. In the MCA vs SSS percentage value, the experimental group B-2 was 0.7%, the closest value to the control group. As a result of the blind test through reconstructed images as a qualitative evaluation, the control group scored the highest with 16 points, and in the experimental group B-2 scored the highest with 15 points. As a result of significance evaluation through an independent sample t-test, the p-value of the control group and the experimental group B-2 was 0.408, which was evaluated as having no significant difference, and other experimental groups were evaluated that there was a significant difference. As a result of analyzing the test performed by changing the ROI position and scan delay time of control and experimental groups A and B, setting the ROI at the circle of willis level and testing after 4-second delay as soon as contrast enhancement is made in MCA will be useful for Brain CTA test in hemorrhagic stroke patients.
在出血性脑卒中患者的脑ct血管造影(brain CTA)测试中，我们试图通过改变感兴趣区域(ROI)的位置和扫描延迟时间来寻找优化脑血管造影增强的测试方法。于2022年9月至2023年2月，对80例急诊行脑CTA检查的患者进行检测，对照组10例无疾病患者，将ROI设为C3 ~ C4水平，在对颈总动脉(CCA)进行裸眼增强后立即进行6秒延迟扫描检测。出血性卒中实验组A组40人，设置与对照组相同的测试方法，在A-0后进行测试;6秒，A-1;8秒，A-2;10秒，A-3;每组10人延迟12秒，实验B组30人在B-1后将ROI设置在willis圈水平和大脑中动脉增强后立即进行测试;2秒，B-2;4秒，B-3;每人延迟6秒，每人10人。评价方法包括定量评价，比较分析对照组和实验组A、B组颈内动脉(ICA)、MCA、上矢状窦(SSS)、颈内静脉(IJV)的平均HU值和百分比值，通过重建图像进行定性评价，采用独立样本t检验进行显著性评价。定量评价结果显示，实验组MCA的平均HU值低于对照组的369 HU，但普遍接近300 HU。在MCA vs SSS百分比值中，实验组B-2为0.7%，与对照组最接近。通过重建图像作为定性评价的盲测结果，对照组得分最高，为16分，实验组B-2得分最高，为15分。通过独立样本t检验进行显著性评价，对照组与试验组B-2的p值为0.408，评价为无显著性差异，其他试验组评价为有显著性差异。通过分析对照组和实验组a、B组通过改变ROI位置和扫描延迟时间进行的测试结果，将ROI设置在willis圈水平，在MCA增强后立即延迟4秒进行测试，将有助于出血性卒中患者的脑部CTA测试。
{"title":"A Study on the Optimization of Contrast Enhancement in Cerebrovascular CT in Hemorrhagic Stroke Patients","authors":"In-Uk Lee, Jae-Seong Choi, Seon-Pyo Lee, Hyeon-Seong Lee","doi":"10.31320/jksct.2023.25.2.61","DOIUrl":"https://doi.org/10.31320/jksct.2023.25.2.61","url":null,"abstract":"During the brain computed tomography angiography (Brain CTA) test of hemorrhagic stroke patients, we tried to find out the test method for optimizing contrast enhancement of cerebrovascular vessels by changing the location of the region of interest (ROI) and scan delay time. From September 2022 to February 2023, 80 patients who visited the emergency room and performed a Brain CTA test were tested, and 10 people in control group without disease were ROI set at C3 to C4 level and performed a test by 6-second delay scan as soon as contrast enhancement was performed on common carotid artery (CCA) with the naked eye. 40 people in the hemorrhagic stroke experiment group A setting the same test method as the control group were tested after A-0; 6 second, A-1; 8 second, A-2; 10 second, A-3; 12-second delay for 10 people each, and 30 people in experiment group B setting ROI at circle of willis level and as soon as contrast enhancement was performed in the middle cerebral artery (MCA) were tested after B-1; 2 second, B-2; 4 second, B-3; 6-second delay for 10 people each. The evaluation methods include quantitative evaluation that compares and analyzes the mean HU values and percentage values of internal carotid artery (ICA), MCA, superior sagittal sinus (SSS), and internal jugular vein (IJV) of the control group and experimental groups A and B, qualitative evaluation through reconstructed images, and significance evaluation was conducted using an independent sample t-test. As a result of the quantitative evaluation, the mean HU value of MCA in the experimental group was measured lower than that of the control group, 369 HU, but was generally close to 300 HU. In the MCA vs SSS percentage value, the experimental group B-2 was 0.7%, the closest value to the control group. As a result of the blind test through reconstructed images as a qualitative evaluation, the control group scored the highest with 16 points, and in the experimental group B-2 scored the highest with 15 points. As a result of significance evaluation through an independent sample t-test, the p-value of the control group and the experimental group B-2 was 0.408, which was evaluated as having no significant difference, and other experimental groups were evaluated that there was a significant difference. As a result of analyzing the test performed by changing the ROI position and scan delay time of control and experimental groups A and B, setting the ROI at the circle of willis level and testing after 4-second delay as soon as contrast enhancement is made in MCA will be useful for Brain CTA test in hemorrhagic stroke patients.","PeriodicalId":487528,"journal":{"name":"대한CT영상기술학회지","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135083041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-30DOI: 10.31320/jksct.2023.25.2.41
Hyo-Jung Kim, Si-On Noh, Yun-Ho Kim, Ye-Bin Bang, Beom-Seok Jang, Nam-Yong Cho, Jun-Hyun Seo
In certain diseases, it can be challenging to differentiate tissues based solely on the HU value. The HU value differs depending on factors such as the patient's body type, CT equipment, and testing conditions. Accordingly, iodine density evaluation is being used as a new diagnostic criterion for CT images. The study was conducted to evaluate the accuracy of the 7500 spectral data that can be obtained even at 100 kVp. It cited iodine density as one of the IQon CT spectral data that could only be obtained at 120 kVp or higher. The iodine density comparison between the 7500 CT and IQon CT was measured within the error range. This was also observed in comparison experiments and collimator change experiments with 100 kVp. As a result of the study, the accuracy of 100 kVp was confirmed, and the CTDI was reduced by 10%. Additionally, when measuring iodine density, it was found that the minimum dose had a significant value, with a reduction of 40%. It is believed that a protocol that reduces CTDIvol by approximately 40% at 100 kVp can be utilized in clinical trials for children and patients with a low body mass index.
{"title":"A Phantom Study of 100 kVp Spectral Data Accuracy Using Iodine Density in Dual-Layer Detector CT","authors":"Hyo-Jung Kim, Si-On Noh, Yun-Ho Kim, Ye-Bin Bang, Beom-Seok Jang, Nam-Yong Cho, Jun-Hyun Seo","doi":"10.31320/jksct.2023.25.2.41","DOIUrl":"https://doi.org/10.31320/jksct.2023.25.2.41","url":null,"abstract":"In certain diseases, it can be challenging to differentiate tissues based solely on the HU value. The HU value differs depending on factors such as the patient's body type, CT equipment, and testing conditions. Accordingly, iodine density evaluation is being used as a new diagnostic criterion for CT images. The study was conducted to evaluate the accuracy of the 7500 spectral data that can be obtained even at 100 kVp. It cited iodine density as one of the IQon CT spectral data that could only be obtained at 120 kVp or higher. The iodine density comparison between the 7500 CT and IQon CT was measured within the error range. This was also observed in comparison experiments and collimator change experiments with 100 kVp. As a result of the study, the accuracy of 100 kVp was confirmed, and the CTDI was reduced by 10%. Additionally, when measuring iodine density, it was found that the minimum dose had a significant value, with a reduction of 40%. It is believed that a protocol that reduces CTDIvol by approximately 40% at 100 kVp can be utilized in clinical trials for children and patients with a low body mass index.","PeriodicalId":487528,"journal":{"name":"대한CT영상기술학회지","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135082664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：