The Tin Filter used in CT scans in medical field has the effect of reducing patient exposure without deteriorating the image quality by block in low-energy X-rays (ranging 30-50 keV) generated from CT scanners. In this study, chest low-dose CT scans were performed with the lungman phantom and various low-dose scan protocol. Then, the image quality of acquired images were evaluated by comparing the radiation dose as to the use of tin filter. The performed evaluation showed that when performing CT scans with a Tin filter installed, the exposure dose was considerably reduced by removing low energy X-rays, but SNR and CNR decreased slightly. Therefore, it is significantly considered that the use of a tin filter in CT scans will help reduce the exposure dose as well as the patient dose while maintaining image quality.
{"title":"Evaluation of Image Quality and Radiation Dose according to Use of the Tin Filter during CT Examination","authors":"Tae-Gyu Song, Hee-Gon Lee, Jang-Seok Lee, Young-Ju Moon","doi":"10.31320/jksct.2023.25.1.5","DOIUrl":"https://doi.org/10.31320/jksct.2023.25.1.5","url":null,"abstract":"The Tin Filter used in CT scans in medical field has the effect of reducing patient exposure without deteriorating the image quality by block in low-energy X-rays (ranging 30-50 keV) generated from CT scanners. In this study, chest low-dose CT scans were performed with the lungman phantom and various low-dose scan protocol. Then, the image quality of acquired images were evaluated by comparing the radiation dose as to the use of tin filter. The performed evaluation showed that when performing CT scans with a Tin filter installed, the exposure dose was considerably reduced by removing low energy X-rays, but SNR and CNR decreased slightly. Therefore, it is significantly considered that the use of a tin filter in CT scans will help reduce the exposure dose as well as the patient dose while maintaining image quality.","PeriodicalId":272693,"journal":{"name":"Korean Society of Computed Tomographic Technology","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117120232","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 : 2023-03-30DOI: 10.31320/jksct.2023.25.1.65
Sang-hoon Park, i-Hwa Baek, Jae-yeon Park, H. Koo, Dong-hwan Kim, Y. Joo
Computed tomography imaging has become a recognized and widely used procedure for the evaluation of patients with aortic dissection, stenosis or aneurysm. In CT, an accurate assessment of the size of the aorta plays a key role in detecting the aneurysm and determining how to treat it. However, despite this pivotal role of CT, there is little data on how accurately a CT scan measures the size of the actual thoracic aorta. Specialists in the Department of Radiology have determined that if the diameter of the thoracic aorta is greater than 40 ㎜, there is a finding of thoracic aortic dilatation, but if these criteria differ from non-contrast CT and Contrast CT, the determination may be difficult, and research is needed. This study was to present the average value and difference in diameter measurement of the thoracic aorta in non-contrast and contrast multi-detection computed tomography images and to see how the value varies with gender, age, and vendor.
{"title":"A Study on the Difference in the Diameter of the Thoracic Aorta according to the Use of Contrast Medium in Computed Tomography","authors":"Sang-hoon Park, i-Hwa Baek, Jae-yeon Park, H. Koo, Dong-hwan Kim, Y. Joo","doi":"10.31320/jksct.2023.25.1.65","DOIUrl":"https://doi.org/10.31320/jksct.2023.25.1.65","url":null,"abstract":"Computed tomography imaging has become a recognized and widely used procedure for the evaluation of patients with aortic dissection, stenosis or aneurysm. In CT, an accurate assessment of the size of the aorta plays a key role in detecting the aneurysm and determining how to treat it. However, despite this pivotal role of CT, there is little data on how accurately a CT scan measures the size of the actual thoracic aorta. Specialists in the Department of Radiology have determined that if the diameter of the thoracic aorta is greater than 40 ㎜, there is a finding of thoracic aortic dilatation, but if these criteria differ from non-contrast CT and Contrast CT, the determination may be difficult, and research is needed. This study was to present the average value and difference in diameter measurement of the thoracic aorta in non-contrast and contrast multi-detection computed tomography images and to see how the value varies with gender, age, and vendor.","PeriodicalId":272693,"journal":{"name":"Korean Society of Computed Tomographic Technology","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114266953","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 : 2023-03-30DOI: 10.31320/jksct.2023.25.1.49
Sung-sik Kim, Rae-Wook Kang, Im-Beom Lee, Jae-Ho Kim, H. Park
The purpose of this study was to find an optimized imaging technique and evaluate its usefulness by comparing and analyzing the difference in contrast enhancement of lower extremity blood vessels according to the patient's heart rate during lower extremity angio CT examination. From January 2022 to August 22nd, 139 outpatients who visited Ajou University Hospital and underwent lower extremity angio CT examination were targeted. According to the heart rate, the groups were divided into four groups: A(HR≤65), B(65
{"title":"Usefulness Evaluation of Lower Extremity CT Angiography Examination using Heart Rate","authors":"Sung-sik Kim, Rae-Wook Kang, Im-Beom Lee, Jae-Ho Kim, H. Park","doi":"10.31320/jksct.2023.25.1.49","DOIUrl":"https://doi.org/10.31320/jksct.2023.25.1.49","url":null,"abstract":"The purpose of this study was to find an optimized imaging technique and evaluate its usefulness by comparing and analyzing the difference in contrast enhancement of lower extremity blood vessels according to the patient's heart rate during lower extremity angio CT examination. From January 2022 to August 22nd, 139 outpatients who visited Ajou University Hospital and underwent lower extremity angio CT examination were targeted. According to the heart rate, the groups were divided into four groups: A(HR≤65), B(65<HR<80), C(80≤HR). In addition, among patients with a heart rate of 65 or less, the heart rate was considered, and the scan was divided into group D with a delay time of 6 seconds. The time of arrival of contrast medium and the average value of contrast enhancement were compared and analyzed. The results were analyzed using SPSS 26 ver. As a result of quantitative evaluation, B and C groups with a heart rate of more than 65 times had better HU values in the popliteal artery than A group (HR≤65), and D group showed better HU improvement effects compared to A group (p<0.001). The difference in heart rate affected the angiographic intensity of the lower extremities artery. Therefore, it is effective to apply the appropriate test timing for each patient by using the heart rate during the lower extremity angio CT Scan.","PeriodicalId":272693,"journal":{"name":"Korean Society of Computed Tomographic Technology","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115686114","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 : 2023-03-30DOI: 10.31320/jksct.2023.25.1.37
Dong-Hwi Kim, J. Mun, Jun-Hwan Kim, Seungh-wan Yun, Hwan-Sang Park, Chang-Kon Kim, Yeong-Deok Kim
The subjects of this study were 2,798 patients who experienced hypersensitivity reaction of contrast media among 72,910 who had had iodinated contrast media administered intravenously and CT examination at our hospital. Retrospective survey was conducted with these subjects. Their age, gender, hypersensitivity reaction symptoms, prepare methods for the patients who had previous hypersensitivity reaction of contrast media, and contrast media administered were analyzed. When it came to the hypersensitivity reaction incidence of contrast media, women and patients aged less than 60 had the high risk of the reaction. Even if patients had previous contrast media hypersensitivity reaction, their hypersensitivity reaction incidence risk was reduced as they had an appropriate premedication drug administered and contrast media were changed. Regarding the hypersensitivity reaction incidence rate by contrast media, Iopromide’s hypersensitivity reaction incidence rate was significantly high, whereas Iohexol and Ioversol had low incidence rates. In order to prevent contrast media hypersensitivity reaction recurrence, it is preferentially necessary to change a contrast media to a different one without reuse of causative contrast media, rather than to use a premedication drug only. Along with that, it is necessary to administer a premedication drug.
{"title":"Hypersensitivity Reaction Incidence Patterns and Risk Factors of Iodinated Contrast Media","authors":"Dong-Hwi Kim, J. Mun, Jun-Hwan Kim, Seungh-wan Yun, Hwan-Sang Park, Chang-Kon Kim, Yeong-Deok Kim","doi":"10.31320/jksct.2023.25.1.37","DOIUrl":"https://doi.org/10.31320/jksct.2023.25.1.37","url":null,"abstract":"The subjects of this study were 2,798 patients who experienced hypersensitivity reaction of contrast media among 72,910 who had had iodinated contrast media administered intravenously and CT examination at our hospital. Retrospective survey was conducted with these subjects. Their age, gender, hypersensitivity reaction symptoms, prepare methods for the patients who had previous hypersensitivity reaction of contrast media, and contrast media administered were analyzed. When it came to the hypersensitivity reaction incidence of contrast media, women and patients aged less than 60 had the high risk of the reaction. Even if patients had previous contrast media hypersensitivity reaction, their hypersensitivity reaction incidence risk was reduced as they had an appropriate premedication drug administered and contrast media were changed. Regarding the hypersensitivity reaction incidence rate by contrast media, Iopromide’s hypersensitivity reaction incidence rate was significantly high, whereas Iohexol and Ioversol had low incidence rates. In order to prevent contrast media hypersensitivity reaction recurrence, it is preferentially necessary to change a contrast media to a different one without reuse of causative contrast media, rather than to use a premedication drug only. Along with that, it is necessary to administer a premedication drug.","PeriodicalId":272693,"journal":{"name":"Korean Society of Computed Tomographic Technology","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126911082","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 : 2023-03-30DOI: 10.31320/jksct.2023.25.1.11
Seong-Min Kim, Yeun-ju Kim, S. Choi, K. Lee
This study was to analyze the effect on patient safety and image quality improvement by lowering the arm and applying a self-made device during chest CT examinations of unconscious patients. From April 1 to September 30, 2022, 78 patients (male: 42, female: 36, mean age: 67 years old) among intensive care unit patients who underwent chest CT scan were retrospectively reviewed. The patients were classified into three positions as follows: both arms raised (A position), both arms straight out using the self-made device (B position), and both arms straight out to the side (C position). For radiation dose comparison, dose length product (DLP) values were measured and compared to each other. For image quality evaluation, image noise, signal to noise ratio (SNR), contrast to noise ratio (CNR), and contrast to dose ratio (CNRDR) values were compared, and qualitative evaluation was also performed. The average DLP value of the B position was significantly lower than that of the C position, and it was relatively higher than that of the A position, but there was no significant difference statistically.(p=0.051) In the quantitative evaluation, it was evaluated that the B position maintains a quality quite similar to that of the A position despite the lowering of the both arms. In addition, in the qualitative evaluation, an average score was obtained between A and C. In conclusion, it was confirmed that the use of the self-made device for rapid and safe chest CT examination of unconscious patients is useful in improving patient dose and image quality.
{"title":"Device Application to Improve Patient Safety and Image Quality during Chest CT Examination of Unconscious Patients","authors":"Seong-Min Kim, Yeun-ju Kim, S. Choi, K. Lee","doi":"10.31320/jksct.2023.25.1.11","DOIUrl":"https://doi.org/10.31320/jksct.2023.25.1.11","url":null,"abstract":"This study was to analyze the effect on patient safety and image quality improvement by lowering the arm and applying a self-made device during chest CT examinations of unconscious patients. From April 1 to September 30, 2022, 78 patients (male: 42, female: 36, mean age: 67 years old) among intensive care unit patients who underwent chest CT scan were retrospectively reviewed. The patients were classified into three positions as follows: both arms raised (A position), both arms straight out using the self-made device (B position), and both arms straight out to the side (C position). For radiation dose comparison, dose length product (DLP) values were measured and compared to each other. For image quality evaluation, image noise, signal to noise ratio (SNR), contrast to noise ratio (CNR), and contrast to dose ratio (CNRDR) values were compared, and qualitative evaluation was also performed. The average DLP value of the B position was significantly lower than that of the C position, and it was relatively higher than that of the A position, but there was no significant difference statistically.(p=0.051) In the quantitative evaluation, it was evaluated that the B position maintains a quality quite similar to that of the A position despite the lowering of the both arms. In addition, in the qualitative evaluation, an average score was obtained between A and C. In conclusion, it was confirmed that the use of the self-made device for rapid and safe chest CT examination of unconscious patients is useful in improving patient dose and image quality.","PeriodicalId":272693,"journal":{"name":"Korean Society of Computed Tomographic Technology","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116496772","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 : 2023-03-30DOI: 10.31320/jksct.2023.25.1.21
Sang-Hun Kim, Woong-Jin Keum, Wan-Youk Kim
During CT (Computed Tomography) examination, Surface Filter made for the reduction of Photon Starvation Artifacts occurring in the patient's shoulder and clavicle was quantitatively evaluated. Image quality was evaluated by changing 120 kVp and 100 mA, 200 mA, and 300 mA fixed to Thorax Phantom, and scattered radiation measurement was performed on the surface of the part to which the filter was applied. As a result, it was confirmed that the SNR(Signal to Noise Ratio) increased by 35.86%, 26.65%, and 18.18%, respectively, and the effect of reducing the thoracic surface dose by an average of 33.7% was shown. The results of this study indicate that it is a useful method that can optimize the image without increasing the dose and reduce the patient's surface dose due to scattered radiation.
{"title":"Quantitative Evaluation of the Use of Surface Filter to Reduce Photon Starvation Artifacts","authors":"Sang-Hun Kim, Woong-Jin Keum, Wan-Youk Kim","doi":"10.31320/jksct.2023.25.1.21","DOIUrl":"https://doi.org/10.31320/jksct.2023.25.1.21","url":null,"abstract":"During CT (Computed Tomography) examination, Surface Filter made for the reduction of Photon Starvation Artifacts occurring in the patient's shoulder and clavicle was quantitatively evaluated. Image quality was evaluated by changing 120 kVp and 100 mA, 200 mA, and 300 mA fixed to Thorax Phantom, and scattered radiation measurement was performed on the surface of the part to which the filter was applied. As a result, it was confirmed that the SNR(Signal to Noise Ratio) increased by 35.86%, 26.65%, and 18.18%, respectively, and the effect of reducing the thoracic surface dose by an average of 33.7% was shown. The results of this study indicate that it is a useful method that can optimize the image without increasing the dose and reduce the patient's surface dose due to scattered radiation.","PeriodicalId":272693,"journal":{"name":"Korean Society of Computed Tomographic Technology","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130651657","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 : 2023-03-30DOI: 10.31320/jksct.2023.25.1.27
Ho-Sung Lee, Seong-Min Oh, Hyeon-Seok Han, H. Yu, Chang-Seop Oh, Min Lee, Yong-Sik Bang
The usefulness of intake water as an oral contrast medium and MonoE(Virtual Monoenergetic Images) 50 keV of DECT(Dual Energy Computed Tomography) was evaluated in Liver CT. In order to compare water intake image and non-water intake image and MonoE 50 keV image of non-water intake data were obtained from 50 patients who underwent liver follow-up CT at our hospital from January 1, 2021 to June 31, 2022 at our hospital, using IQon Spectral CT (Philips Healthcare, Netherlands). In the same patient, compared to non-water intake image, both Water intake image and MonoE 50 keV image of non-water intake showed an increase in the average values of HU of portal vein, liver parenchyma, SNR, CNR. As a result of quantitative analysis using the paired-sample t-test of SPSS (Statistical Package For Social Science, IBM, US), showed a statistically significant increase in portal vein, liver parenchyma, SNR, CNR in all phases except for the liver parenchyma of Artery Phase. In particular, in the case of MonoE 50 keV, it was confirmed that SNR and CNR increased significantly. Both water intake as an oral contrast and MonoE 50 keV of DECT showed significant increases in SNR and CNR compared to when non-water intake. If MonoE 50 keV using DECT is applied to patients who are restricted water intake and difficult to intake due to poor general conditions, it is believed that the safety and convenience of patients will be increased, and the satisfaction of CT will be improved.
在肝脏CT上评价了饮水作为口服造影剂和双能CT(Dual Energy Computed Tomography, DECT) 50 keV的mone (Virtual Monoenergetic Images)的有效性。为了比较2021年1月1日至2022年6月31日在我院行肝脏CT随访的50例患者的摄水图像与非摄水图像及monoe50kev图像的数据，采用IQon频谱CT (Philips Healthcare，荷兰)。在同一患者中，与不喝水的图像相比，喝水图像和不喝水的monoe50kev图像均显示门静脉HU、肝实质、信噪比、CNR的平均值升高。采用SPSS (Statistical Package For Social Science, IBM, US)的配对样本t检验进行定量分析，除动脉期肝实质外，其余各期门静脉、肝实质、信噪比、CNR均有统计学意义的升高。特别是在MonoE 50 keV的情况下，证实了信噪比和CNR的显著提高。与不饮水时相比，饮水作为口服对照和DECT的monoe50kev均显示信噪比和CNR显著增加。如果将使用DECT的MonoE 50 keV应用于一般情况较差、饮水受限、饮水困难的患者，相信会增加患者的安全性和便利性，提高CT满意度。
{"title":"Usefulness Evaluation of Water as an Oral Contrast Medium and Virtual Monoenergetic Images in Liver CT","authors":"Ho-Sung Lee, Seong-Min Oh, Hyeon-Seok Han, H. Yu, Chang-Seop Oh, Min Lee, Yong-Sik Bang","doi":"10.31320/jksct.2023.25.1.27","DOIUrl":"https://doi.org/10.31320/jksct.2023.25.1.27","url":null,"abstract":"The usefulness of intake water as an oral contrast medium and MonoE(Virtual Monoenergetic Images) 50 keV of DECT(Dual Energy Computed Tomography) was evaluated in Liver CT. In order to compare water intake image and non-water intake image and MonoE 50 keV image of non-water intake data were obtained from 50 patients who underwent liver follow-up CT at our hospital from January 1, 2021 to June 31, 2022 at our hospital, using IQon Spectral CT (Philips Healthcare, Netherlands). In the same patient, compared to non-water intake image, both Water intake image and MonoE 50 keV image of non-water intake showed an increase in the average values of HU of portal vein, liver parenchyma, SNR, CNR. As a result of quantitative analysis using the paired-sample t-test of SPSS (Statistical Package For Social Science, IBM, US), showed a statistically significant increase in portal vein, liver parenchyma, SNR, CNR in all phases except for the liver parenchyma of Artery Phase. In particular, in the case of MonoE 50 keV, it was confirmed that SNR and CNR increased significantly. Both water intake as an oral contrast and MonoE 50 keV of DECT showed significant increases in SNR and CNR compared to when non-water intake. If MonoE 50 keV using DECT is applied to patients who are restricted water intake and difficult to intake due to poor general conditions, it is believed that the safety and convenience of patients will be increased, and the satisfaction of CT will be improved.","PeriodicalId":272693,"journal":{"name":"Korean Society of Computed Tomographic Technology","volume":"29 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123488053","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 : 2023-03-30DOI: 10.31320/jksct.2023.25.1.57
Soo-Been Lee, Sang-Hun Kim, Dong-Chan Sung, Wan-Youk Kim
This study analyzed the usefulness of standard, bone, edge and FBP, ASIR, ASIR-V, MAR algorithm to reduce noise caused by low mA and to reduce artifacts caused by fine needle. The CT number value measured through the phantom study was higher in order of MAR, edge, bone, and standard algorithm. In the case of using the ASIR-V in the algorithm excluding MAR, the noise value was reduced compared to the case of using ASIR. In particular, the edge algorithm showed an average noise reduction effect of 4.59times when ASIR-V was applied compared to other algorithms and also scored high in the sharpness of the fine needle. MAR algorithm has the highest CT number and the lowest noise value, but it is difficult to apply clinically because of the severe distortion of the fine needles. As a result of this study, it is considered that the application of edge algorithm with ASIR-V algorithm will be more useful than the application of MAR algorithm in CT examination using fine needles.
{"title":"Usefulness Evaluation of Algorithm for Reducing Noise and Artifact in CT Guided Biopsy Using Fine Needles","authors":"Soo-Been Lee, Sang-Hun Kim, Dong-Chan Sung, Wan-Youk Kim","doi":"10.31320/jksct.2023.25.1.57","DOIUrl":"https://doi.org/10.31320/jksct.2023.25.1.57","url":null,"abstract":"This study analyzed the usefulness of standard, bone, edge and FBP, ASIR, ASIR-V, MAR algorithm to reduce noise caused by low mA and to reduce artifacts caused by fine needle. The CT number value measured through the phantom study was higher in order of MAR, edge, bone, and standard algorithm. In the case of using the ASIR-V in the algorithm excluding MAR, the noise value was reduced compared to the case of using ASIR. In particular, the edge algorithm showed an average noise reduction effect of 4.59times when ASIR-V was applied compared to other algorithms and also scored high in the sharpness of the fine needle. MAR algorithm has the highest CT number and the lowest noise value, but it is difficult to apply clinically because of the severe distortion of the fine needles. As a result of this study, it is considered that the application of edge algorithm with ASIR-V algorithm will be more useful than the application of MAR algorithm in CT examination using fine needles.","PeriodicalId":272693,"journal":{"name":"Korean Society of Computed Tomographic Technology","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122966139","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 : 2022-09-30DOI: 10.31320/jksct.2022.24.2.55
Kyoung-jin Park, Sang-hyub Park
Computed Tomography (CT) has been used for liver volume measurement because of the highest location accuracy. Automated segmentation methods may improve CT volumetry time, but it has low accuracy. Residual U-Net which is one of the deep learning methods could improve segmentation accuracy. However optimization of residual U-Net hasn’t been demonstrated yet. The purpose of this paper is to investigate the optimal complexity for CT liver volumetry. The study was conducted using the 3D-IRCADb01 Datasets (10 males, 10 females) published by MIS Training Center, 15 people learned and 5 people tested. Segmented images were generated using Deep Residual U-Nets with a total of four different complexity. As a result, as the model became more complex, the total parameters and training time increased exponentially. In all models, both training and testing showed more than 97% accuracy. All losses were less than 0.2. In the case of DCL, it was the lowest at 0.8037 in 3-layer and the highest at 0.9533 in 5-layer. In conclusion, 5 hidden layers of residual U-Net has the highest dice coefficient loss and could train the datasets faster than other complex models.
由于定位精度高，计算机断层扫描(CT)已被用于肝脏体积测量。自动分割方法可以提高CT体积测量时间，但精度较低。残差U-Net是一种深度学习方法，可以提高分割精度。然而，剩余U-Net的优化还没有得到证实。本文的目的是探讨CT肝脏体积测量的最佳复杂度。本研究使用MIS Training Center发布的3D-IRCADb01数据集(男10人，女10人)，学习15人，测试5人。使用深度残差U-Nets生成四种不同复杂度的分割图像。因此，随着模型的复杂化，总参数和训练时间呈指数增长。在所有模型中，训练和测试的准确率都超过97%。所有损失均小于0.2。DCL 3层最低，为0.8037,5层最高，为0.9533。综上所述，残差U-Net的5层隐含层具有最高的骰子系数损失，并且可以比其他复杂模型更快地训练数据集。
{"title":"Model Complexity of Deep Residual U-NET for CT Liver Volumetry","authors":"Kyoung-jin Park, Sang-hyub Park","doi":"10.31320/jksct.2022.24.2.55","DOIUrl":"https://doi.org/10.31320/jksct.2022.24.2.55","url":null,"abstract":"Computed Tomography (CT) has been used for liver volume measurement because of the highest location accuracy. Automated segmentation methods may improve CT volumetry time, but it has low accuracy. Residual U-Net which is one of the deep learning methods could improve segmentation accuracy. However optimization of residual U-Net hasn’t been demonstrated yet. The purpose of this paper is to investigate the optimal complexity for CT liver volumetry. The study was conducted using the 3D-IRCADb01 Datasets (10 males, 10 females) published by MIS Training Center, 15 people learned and 5 people tested. Segmented images were generated using Deep Residual U-Nets with a total of four different complexity. As a result, as the model became more complex, the total parameters and training time increased exponentially. In all models, both training and testing showed more than 97% accuracy. All losses were less than 0.2. In the case of DCL, it was the lowest at 0.8037 in 3-layer and the highest at 0.9533 in 5-layer. In conclusion, 5 hidden layers of residual U-Net has the highest dice coefficient loss and could train the datasets faster than other complex models.","PeriodicalId":272693,"journal":{"name":"Korean Society of Computed Tomographic Technology","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121316008","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 : 2022-09-30DOI: 10.31320/jksct.2022.24.2.49
Moo-geon Kim, Woong-Jin Keum, Young-Kyoon Kim
The purpose of this study was to measure whether the volume of calcium due to cardiac artery calcification changes by functions different from that of the kernel, and to improve the use of more accurate kernels and functions. A Somatom Force(Siemens Healthineers, Forchheim, Germany) was used as CT equipment. Based on the Sa36 kernel, the Agatston score and volumes of calcium with the Br32, Br36, and Br40 kernels were compared. In addition, variables were added to the Br36 kernel by applying the equipment's unique function, iBHC(Beam Hardening Correction). The image was analyzed using the calcium score function of Aquarius iNtusion Edition ver. 4.4.13 P6 software(Terarecon, California, USA). There was a statistically significant difference between the Sa36 kernel to which the iBHC algorithm was applied and the Agatston scores and volumes of the Br32, Br36, and Br40 kernels to which the iBHC algorithm was not applied. In addition, there was a statistically significant difference between the Sa36 kernel to which the iBHC algorithm was applied, the Br36 kernel to which the iBHC algorithm was applied, and the Agatston score and volume of the Br36 kernel to which the iBHC algorithm was not applied. As a result, it can be seen that the Agatston score and volume of calcium change with the change in the kernel and with the application of the iBHC algorithm. Protocol correction is essential for accurate diagnosis and differentiation of coronary artery disease. To this end, it is necessary to use intermediate-level kernels such as Sa36 kernels and to use careful iBHC algorithms.
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