Korean Society of Computed Tomographic Technology最新文献_第2页

A Study on Stoke Volume and Ejection Fraction Change according to Threshold Setting of Heart Volumetry 心脏容积法阈值设置对心肌容量和射血分数变化的影响

Korean Society of Computed Tomographic Technology Pub Date : 2022-09-30 DOI: 10.31320/jksct.2022.24.2.11

Han-na Yoo, Eun-Ju Lee, Yeong-Ran Kim, S. Park

{"title":"A Study on Stoke Volume and Ejection Fraction Change according to Threshold Setting of Heart Volumetry","authors":"Han-na Yoo, Eun-Ju Lee, Yeong-Ran Kim, S. Park","doi":"10.31320/jksct.2022.24.2.11","DOIUrl":"https://doi.org/10.31320/jksct.2022.24.2.11","url":null,"abstract":"This study was based on the threshold-based volume cut method designed to measure the volume of the heart most accurately. The purpose of this study was to find out the changes in stroke volume (SV) and ejection fraction (EF) values according to the threshold change. Among the patients under the age of 15 who underwent the heart volumetric computed tomography (CT) examination in this hospital for one year from January to December 2020, 68 patients under the age of 15 were targeted. The SV and the EF according to the threshold value weight were calculated and compared through the data. The volume of the ventricle measured by applying weights from the existing threshold value became smaller as the ratio of the applied value increased from 10%. When 100% of the volume value was applied, the SV value of left ventricle calculated based on the value showed an average change of 43%, and the SV value of right ventricle showed an average change of 40.1%. EF showed a significant difference in all EF change values (EF 10% to EF 100%) in addition to the EF value obtained by the determined threshold. The setting of the threshold value that precedes the post-processing of cardiac volume CT has a great influence on the result value. As a result, diagnosis and treatment directions may vary, so it is considered that accurate segmentation criteria are needed.","PeriodicalId":272693,"journal":{"name":"Korean Society of Computed Tomographic Technology","volume":"6 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":"127794663","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}

引用次数: 0

A Study on Image Quality and Dose of Coronary CT Angiography with ECG Window Acquisition Range Unit Conversion 基于ECG窗口采集范围单位转换的冠状动脉CT造影图像质量和剂量研究

Korean Society of Computed Tomographic Technology Pub Date : 2022-09-30 DOI: 10.31320/jksct.2022.24.2.21

Jang-Woo Jo, H. Chae, Choong-Beom Seo, Eun-Hee Seo, Chang-min Dae, Tae-Eun Kim

{"title":"A Study on Image Quality and Dose of Coronary CT Angiography with ECG Window Acquisition Range Unit Conversion","authors":"Jang-Woo Jo, H. Chae, Choong-Beom Seo, Eun-Hee Seo, Chang-min Dae, Tae-Eun Kim","doi":"10.31320/jksct.2022.24.2.21","DOIUrl":"https://doi.org/10.31320/jksct.2022.24.2.21","url":null,"abstract":"The purpose of this study was to evaluate radiation dose and image quality compared to those of the relative delay scan when using an absolute delay scan after converting the ECG window acquisition unit in coronary CT angiography. We used chest phantom and ECG simulator through the phantom study. Patient study was conducted on 90 sinus rhythm patients and 76 atrial fibrillation patients. The absolute delay scan was performed after unit conversion based on the average heart rate. After setting the region of interest, quantitative evaluation of image quality was made, qualitative evaluation was made by two observers. The dose was evaluated using the CTDIvol and DLP. There were no significant differences in quantitative values in terms of the phantom study. At an irregular heart rate 79, the CTDIvol of the experimental group decreased by 18% compared to the control group, the DLP decreased by 17.4% compared to the control group.(P<0.05) As a result of patient study, there were no significant differences in quantitative values in terms of the patient study. The CTDIvol of the artrial fibrillation experimental group decreased by 33% compared to the control group, the DLP decreased by 30% compared to the control group.(P<0.05) As a result, when examining coronary CT angiography of patients with atrial fibrillation, it will help reduce the patient’s dose without affecting the image quality if the scan range is set after converting the ECG window acquisition unit to milliseconds based on the average heart rate.","PeriodicalId":272693,"journal":{"name":"Korean Society of Computed Tomographic Technology","volume":"24 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":"127134313","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}

引用次数: 0

Comparative Evaluation of CT Angiography Images Applied with CE-BOOST CT血管造影图像应用CE-BOOST的对比评价

Korean Society of Computed Tomographic Technology Pub Date : 2022-09-30 DOI: 10.31320/jksct.2022.24.2.43

Gi-Jin Kwon, Soo-Yeong Lee, Seul-Bi Lee, Sang-Hyeon Jeon, Seong-Su Shin, Sang-Heon Jang, P. Jeon

引用次数: 0

Usefulness Assessment of Virtual Monochromatic Image using Dual Layer Detector CT in Head & Neck Computed Tomography 双层检测器CT虚拟单色图像在头颈部计算机断层扫描中的有效性评价

Korean Society of Computed Tomographic Technology Pub Date : 2022-09-30 DOI: 10.31320/jksct.2022.24.2.1

Mun-Seong Kwon, H. Yu, Chang-Seop Oh, Min Lee, Yong-Sik Bang, Hyeon-Seok Han

{"title":"Usefulness Assessment of Virtual Monochromatic Image using Dual Layer Detector CT in Head & Neck Computed Tomography","authors":"Mun-Seong Kwon, H. Yu, Chang-Seop Oh, Min Lee, Yong-Sik Bang, Hyeon-Seok Han","doi":"10.31320/jksct.2022.24.2.1","DOIUrl":"https://doi.org/10.31320/jksct.2022.24.2.1","url":null,"abstract":"Among the many functions of dual-energy computed tomography (CT), virtual monochromatic images provide various diagnostic values compared to conventional iterative reconstruction images, such as increasing visualization of intravascular iodine or reducing beam hardening artifact according to monochromatic image level. The optimal monochromatic image level for diagnosis differs for each applied anatomical site, In the neck CT protocol, we intend to find the optimal level of virtual monochromatic images for diagnosis through quantitative methods. We retrospectively studied 33 patients performed on dual layer detector type IQon Spectral CT (Philips, Amsterdam, Netherlands). The evaluation site was designated as the common carotid artery, internal jugular vein, sternocleidomastoid muscle, submandibular glands, and thyroid glands. As an indicator of image evaluation, the contrast-to-noise ratio (CNR) formula set against the background of sternocleido-mastoid muscle and signal-to-noise ratio (SNR) was used. The IMR and iDose iterative reconstruction images and the monochromatic Images 40 keV to 100 keV with the images at intervals of 10 keV were compared. After the normality test of the data was performed to check whether there was a significant difference in the mean of the comparative images, the Friedman test, a nonparametric response sample test, was performed, and all data were significantly different from each other. As a result of the experiment, SNR and CNR were measured the highest in the monochromatic 40 keV image of all evaluation sites except the sternocleido-mastoid muscle. Monochromatic 40 keV image is expected to help diagnose by providing better image quality and higher contrast in quantitative terms than the iterative reconstruction images used in existing clinical trials, and provides the possibility of reducing the amount of contrast medium used in the study.","PeriodicalId":272693,"journal":{"name":"Korean Society of Computed Tomographic Technology","volume":"53 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":"123313135","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}

引用次数: 0

A Study on Spatial Resolution according to Composition Material of ACR phantom in MDCT 基于复合材料的MDCT ACR影体空间分辨率研究

Korean Society of Computed Tomographic Technology Pub Date : 2022-09-30 DOI: 10.31320/jksct.2022.24.2.35

Woong-Jin Keum, Moo-geon Kim, Ju-Wan Hong, Yung-kyoon Kim

{"title":"A Study on Spatial Resolution according to Composition Material of ACR phantom in MDCT","authors":"Woong-Jin Keum, Moo-geon Kim, Ju-Wan Hong, Yung-kyoon Kim","doi":"10.31320/jksct.2022.24.2.35","DOIUrl":"https://doi.org/10.31320/jksct.2022.24.2.35","url":null,"abstract":"The modulation transfer function (MTF) is well known as a crucial parameter in quality assurance of computed tomography (CT) scanners that provides detailed information of both contrast and resolution of CT images. In this study, modulation transfer function (MTF) of multi-detector computed tomography (MDCT) was evaluated by changing the substance of phantom and the measurement parameters. The analysis of MTF gives following results: 1) Bone (the highest contrast material) and air (the lowest contrast material) exhibited variance by 0.030 lp/cm at MTF(50%). 2) In addition, slice thickness of 1.25-mm and 10.0-mm exhibited 0.110 lp/cm and 0.065 lp/cm at MTF(50%), respectively. 3) MTF (50%) showed 50.31% difference depending on the image reconstruction algorithm. Especially, bone algorithm showed higher MTF (50%) than standard algorithm by 26.69%. 4) In addition, the Full (360°) mode linear interpolation showed higher MTF (50%) than the Plus (540°) mode by 10.71%. For a accurate measurement of MTF while performing CT quality control, a phantom module which consists of diverse substance is required. Also, the optimal image which reflecting the size and shape of lesion can be obtained with a suitable scanning factor for diagnosis.","PeriodicalId":272693,"journal":{"name":"Korean Society of Computed Tomographic Technology","volume":"16 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":"130260046","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}

引用次数: 0

Effectiveness of Tube Voltage Selection of 70 kV in Abdominal Dual Energy CT Protocol 70 kV管电压选择在腹部双能CT方案中的有效性

Korean Society of Computed Tomographic Technology Pub Date : 2022-03-31 DOI: 10.31320/jksct.2022.24.1.15

Yupum Kim, Eun Young Choi, Sang-Heon Jeong, H. Jung, Yong-Sik Bang

{"title":"Effectiveness of Tube Voltage Selection of 70 kV in Abdominal Dual Energy CT Protocol","authors":"Yupum Kim, Eun Young Choi, Sang-Heon Jeong, H. Jung, Yong-Sik Bang","doi":"10.31320/jksct.2022.24.1.15","DOIUrl":"https://doi.org/10.31320/jksct.2022.24.1.15","url":null,"abstract":"Recently, CT equipment has a dose modulation function that adjusts the dose to the patient. But, the dose is proportional to the tube voltage and changes with the square of the tube current. Therefore, reducing tube voltage rather than tube current has a greater effect on reducing radiation exposure. High tube voltage is used to improve image noise and contrast resolution. When high tube voltage is used, the surface dose is reduced, but the overall exposure dose is increased. So, the dose should be appropriately adjusted to the patient. Accordingly, research and attempts to obtain high-quality images with a small dose are continuously being conducted, the development of detectors and software performance are improving. Due to the improvement of CT equipment, 70 kV can be used for dual scan. In this study, the 70 kV, and 80 kV, 90 kV, 100 kV used in the conventional CT examination were compared and evaluated at the same dose. The study was conducted using ACR Phantom and KAGAKU Abdomen Phantom. CT number(HU), Noise, SNR, and CNR of each image were compared by quantitative evaluation, and CT number and noise level were evaluated by qualitative evaluation. As a result of comparison, using 70 kV obtained equivalent or better noise, CT number, SNR, and CNR than 80 kV, 90 kV, and 100 kV with the same CTDIvol. In conclusion, it is considered that diagnostically excellent image can be obtained with a small exposure dose by dual scan using 70 kV.","PeriodicalId":272693,"journal":{"name":"Korean Society of Computed Tomographic Technology","volume":"268 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123111574","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}

引用次数: 0

Comparison of Accuracy of Coronary Artery Calcium Score between Artificial Intelligence and Manual Method 人工智能与人工方法冠状动脉钙化评分准确率的比较

Korean Society of Computed Tomographic Technology Pub Date : 2022-03-31 DOI: 10.31320/jksct.2022.24.1.9

H. Yu, Han Kim, Changseok Oh, Min Lee, Yong-Sik Bang

引用次数: 0

A Study on the Correlation of Left Atrial Volume Change according to Left Ventricular Contraction in Atrial Fibrillation 心房颤动左室收缩与左房容积变化相关性的研究

Korean Society of Computed Tomographic Technology Pub Date : 2022-03-31 DOI: 10.31320/jksct.2022.24.1.23

Sung Kwan Kim, H. Chae, Choong-Beom Seo, Eun-Hee Seo, Chang-min Dae, Tae Eun Kim

{"title":"A Study on the Correlation of Left Atrial Volume Change according to Left Ventricular Contraction in Atrial Fibrillation","authors":"Sung Kwan Kim, H. Chae, Choong-Beom Seo, Eun-Hee Seo, Chang-min Dae, Tae Eun Kim","doi":"10.31320/jksct.2022.24.1.23","DOIUrl":"https://doi.org/10.31320/jksct.2022.24.1.23","url":null,"abstract":"The purpose of this study was to increase accuracy and success rate of radiofrequency catheter ablation by analysis of left atrial volume change relative to left ventricular volume change and left atrial diameter change relative to left atrial volume change. 20 patients with normal heart rhythm were set as the control group, and 20 patients with diagnosed atrial fibrillation were set as the experimental group. The cardiac cycle was divided into 10 stages ranging from 0% to 90%, and left ventricular volume, left atrial volume, left atrial diameter, pulmonary vein diameter were measured for each group. the correlation between the left ventricular volume and the left atrial volume was analyzed, and the correlation between the left atrial volume and left atrial diameter was analyzed. The diameter of the pulmonary veins was measured. As a result of analyzing the correlation between left ventricular volume and left atrial volume through Spearman correlation, the control group showed a negative correlation.(P<0.001) The experimental group were not correlated.(P=0.075) As a result of analyzing the correlation between the left atrial volume and the left atrial diameter, both groups showed a positive correlation.(P<0.001) As a result of analyzing the diameter of the pulmonary vein by Wilcoxon signed-rank test, both groups showed a significant difference in the maximum diameter and the minimum diameter.(P<0.001) Because the volume and diameter of the left atrium in patients with atrial fibrillation change irregularly, the radiologist check all cardiac cycle and reconstruct to increase the accuracy and success rate of radiofrequency catheter ablation.","PeriodicalId":272693,"journal":{"name":"Korean Society of Computed Tomographic Technology","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125264452","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}

引用次数: 0

The Usability Assessment of the Self-Produced Table for the Quality Control of Mobile CT 自制移动CT质量控制表的可用性评估

Korean Society of Computed Tomographic Technology Pub Date : 2022-03-31 DOI: 10.31320/jksct.2022.24.1.1

D. Jang, S. Choi, Dan-Bi Lee

{"title":"The Usability Assessment of the Self-Produced Table for the Quality Control of Mobile CT","authors":"D. Jang, S. Choi, Dan-Bi Lee","doi":"10.31320/jksct.2022.24.1.1","DOIUrl":"https://doi.org/10.31320/jksct.2022.24.1.1","url":null,"abstract":"Since there are no tables customized for mobile CT examinations, it is difficult to place the AAPM phantom to the isocenter during the quality control. This produced a phantom table for the quality control of Mobile CT, assessing its utility through conducting a quantitative evaluation through CNR value comparison between with and without the use of the table on low contrast resolution images among 20 phantom images evaluation, along with a qualitative assessment conducted on the scale of 1 to 5 by 5 quality control operators. \u0000The obtained average CNR values from low contrast resolution images in the order of the table being used and not used are -0.01069 ± 0.00149 vs -0.01485 ± 0.00208, -0.01277 ± 0.00131 vs -0.01526 ± 0.00215, -0.01419 ± 0.00144 vs -0.01671 ± 0.00277, -0.01651 ± 0.00140 vs -0.01836 ± 0.00199, -0.01542 ± 0.0188 vs -0.01836 ± 0.00199 from A-row, -0.01132 ± 0.00134 vs -0.01300 ± 0.00222, -0.1202 ± 0.00129 vs -0.01369 ± 0.00145, -0.001391 ± 0.00163 vs -0.01460 ± 0.00139, -0.01607 ± 0.00185 vs -0.01683 ± 0.00182, -0.01502 ± 0.00170 vs -0.01656 ± 0.00125 from B-row, indicating higher absolute values of CNR when the table is being used than not being used, which corresponds to more suitable images. Furthermore, the average score of all items in qualitative assessment has increased from 3.64 to 4.24, suggesting statistically significant margin of increase especially on the items of efficiency and the quality of images. In conclusion, placing the phantom on a more accurate isocenter through the exploitation of the table produced through this research provides phantom images with higher quality along with the decrease of unnecessary efforts from the operators.","PeriodicalId":272693,"journal":{"name":"Korean Society of Computed Tomographic Technology","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124577566","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}

引用次数: 0

Effect of 3D Printing Material and Thickness on CT Image Quality and Shielding 3D打印材料和厚度对CT图像质量和屏蔽的影响

Korean Society of Computed Tomographic Technology Pub Date : 2022-03-31 DOI: 10.31320/jksct.2021.24.1.37

Dae-Yeon Ryu, Sang Hyub Park

引用次数: 0