Estimation of Optimum Flip Angle using 3D VANE XD Technique: Focused on Pre-Contrast and Hepatobiliary Phase

IF 0.6 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Magnetics Pub Date : 2022-06-30 DOI:10.4283/jmag.2022.27.2.201
E. Goo
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Abstract

To investigate the optimum flip angle that can enhance image quality, SNR (signal to noise ratio), and CNR (contrast to noise ratio), comparing the images obtained, applying flip angles, 11°, 14°, 17°, 20°, and 23° in get-ting Liver Hepatobiliary Phase image using 3D VANE XD(3D Multivane mDixon, Philips Healthcare) technique. Experiments were conducted on a total of 30 outpatients and inpatients to our hospital (HCC:10, Metastasis:10, Abscess:10). As for the equipment used in the experiments, Philips Ingenia 3.0T CX was used, and all parameters other than the flip angle were set the same to conduct the tests. As for the image analysis method, using the Image-J program (National Institutes of Health and LOCI), the SNR of the liver, kidney, and pancreas obtained from the images by flip angle before the contrast medium injection and the CNR between the lesion and the normal tissue after the contrast medium injection were measured to conduct comparative analysis. As a result of a comparison of images before and after the contrast medium injection by disease, when the flip angle of 17° was applied, SNR and CNR were measured higher than in the images of other flip angles (p<0.05). In the comparisons of the images taken before and after the injection of contrast medium by disease, when a flip angle of 17° was applied, the SNR before contrast medium injection was 28-29 % higher, and the SNR after the injection of contrast medium was 11 % up to 49 % higher than that at other flip angles. There was a difference in CNR before contrast medium injection of 30-43 % and CNR after contrast medium injection of 58-68 %. The measured value increased up to 17° and then decreased after that. Additionally, in the qualitative evaluation, Lesion Conspicuity (p=0.003), Image Artifact (p=0.0001), Lesion Delineation (p=0.0002), and Vascular Anatomy (p=0.0002) received the most excellent evaluations at 17°. In conclusion, in this study, the flip angle of 17° provided the highest SNR and CNR values when the tests were conducted using the free breath hold technique, 3D VANE XD Sequence. Thus, in liver MRI protocol tests, the overall diagnostic information was provided, including hypervascular tumor.
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利用3D VANE XD技术估计最佳翻转角度:集中在造影剂前和肝胆期
为了研究可以提高图像质量、信噪比(SNR)和噪比(CNR)的最佳翻转角度,比较获得的图像,使用3D VANE XD(3D Multivane mDixon, Philips Healthcare)技术,应用11°、14°、17°、20°和23°翻转角度获得肝脏肝胆相图像。实验共选取我院门诊和住院患者30例(HCC:10例,转移:10例,脓肿:10例)。实验使用的设备为Philips Ingenia 3.0T CX,除翻转角度外其他参数设置相同,进行实验。在图像分析方法上,使用image - j程序(National Institutes of Health and LOCI),测量注射造影剂前通过翻转角度获得的图像中肝脏、肾脏和胰腺的信噪比,以及注射造影剂后病变与正常组织的CNR,进行对比分析。对比疾病注射造影剂前后的图像,采用17°翻转角度时,SNR和CNR均高于其他翻转角度的图像(p<0.05)。对比疾病注射造影剂前后的图像,当翻转角度为17°时,注射造影剂前的信噪比比其他翻转角度高28 ~ 29%,注射造影剂后的信噪比比其他翻转角度高11% ~ 49%。注射造影剂前的CNR为30 ~ 43%,注射造影剂后的CNR为58 ~ 68%。测量值在达到17°时增大,之后减小。此外,在定性评价中,病变显著性(p=0.003)、图像伪影(p=0.0001)、病变描绘(p=0.0002)和血管解剖(p=0.0002)在17°时获得了最好的评价。综上所述,在本研究中,当使用自由屏气技术3D VANE XD序列进行测试时,17°的翻转角度提供了最高的信噪比和CNR值。因此,在肝脏MRI方案测试中,提供了包括高血管肿瘤在内的总体诊断信息。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Magnetics
Journal of Magnetics MATERIALS SCIENCE, MULTIDISCIPLINARY-PHYSICS, APPLIED
CiteScore
1.00
自引率
20.00%
发文量
44
审稿时长
2.3 months
期刊介绍: The JOURNAL OF MAGNETICS provides a forum for the discussion of original papers covering the magnetic theory, magnetic materials and their properties, magnetic recording materials and technology, spin electronics, and measurements and applications. The journal covers research papers, review letters, and notes.
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