• Title/Summary/Keyword: radiological science

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Effect of Major Satisfaction on Career Commitment for Students in Department of Radiological Science (방사선학과 학생들의 전공만족도가 진로결정몰입도에 미치는 영향)

  • So, Woonyoung;Kim, So Yeon;Park, Chae Yeon;Kim, Yeon Jun;Roh, Hyo Lyun
    • Journal of the Korean Society of Radiology
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    • v.13 no.3
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    • pp.415-424
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    • 2019
  • The purpose of this study would like to investigate the effect of major satisfaction on the career decision commitment for students in department of radiological science. Using the structured questionnaire we perform the self-report survey for 218 students. As a result, the degree of major satisfaction for students is found to be mid-range, and the degree of career decision commitment for ones is lowest in the first graders and the highest in the fourth graders. A notable point is that the degree of major satisfaction seems to have a significant influence on career decision commitment. Especially, it was found that major of pride is the most influential factor in career decision commitment. From this study, finally, it seems that a method to improve the career decision commitment is needed because the degree of career decision commitment of students is assessed to be fairly lowered at a level of non-commitment.

A Study on the Application of Deep Learning Model by Using ACR Phantom in CT Quality Control (CT 정도관리에서 ACR 팬텀을 이용한 딥러닝 모델 적용에 관한 연구)

  • Eun-Been Choi;Si-On Kim;Seung-Won Choi;Jae-Hee Kim;Young-Kyun Kim;Dong-Kyun Han
    • Journal of radiological science and technology
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    • v.46 no.6
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    • pp.535-542
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    • 2023
  • This study aimed to implement a deep learning model that can perform quantitative quality control through ACTS software used for quantitative evaluation of ACR phantom in CT quality control and evaluate its usefulness. By changing the scanning conditions, images of three modules of the ACR phantom's slice thickness (ST), low contrast resolution (LC), and high contrast resolution (HC) were obtained and classified as ACTS software. The deep learning model used ResNet18, implementing three models in which ST, HC, and LC were learned with epoch 50 and an integrated model in which three modules were learned with Epoch 10, 30, and 50 at once. The performance of each model was evaluated through Accuracy and Loss. When comparing and evaluating the accuracy and loss function values of the deep learning models by ST, LC, and HC modules, the Accuracy and Loss of the HC model were the best with 100% and 0.0081, and in the integrated model according to the Epoch value, Accuracy and Loss with epoch 50 were the best with 96.29% and 0.1856. This paper showed that quantitative quality control is possible through a deep learning model, and it can be used as a basis and evidence for applying deep learning to the CT quality control.

Feasibility of Percutaneous Pancreatic Stent Placement in Postoperative Pancreaticojejunostomy Stenosis

  • Juil Park;Kichang Han;Joon Ho Kwon;Man-Deuk Kim;Jong Yun Won;Sungmo Moon;Gyoung Min Kim
    • Korean Journal of Radiology
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    • v.24 no.12
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    • pp.1241-1248
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    • 2023
  • Objective: To evaluate the role of percutaneous pancreatic stent placement in postoperative pancreaticojejunostomy stenosis (PJS). Materials and Methods: This retrospective single-center study included seven procedures in five patients (four males and one female; median age, 63 years) who underwent percutaneous pancreatic stent placement for postoperative PJS between January 2005 and December 2021. The patients were referred to interventional radiology because of unfavorable anatomy or bowel abnormalities. The pancreatic duct was accessed under ultrasound and/or computed tomography guidance. A stent was placed after balloon dilatation of the PJS. Moreover, plastic stents were placed for the first two procedures, whereas bare-metal stents were used for the remaining five procedures. Technical success was defined as the successful placement of stents for the PJS, meanwhile, clinical success was defined as the normalization of pancreatic enzymes without recurrence of pancreatitis. Results: Pancreatic duct access and stent placement were successfully performed in all patients (technical success rate: 100%). All the procedures initially yielded clinical success. However, recurrence of pancreatitis was observed after two procedures that used plastic stents because of stent migration at 0.3 and 3 months after the procedure. In contrast, no instances of recurrent pancreatitis were noted after metal stent placement for a follow-up duration of 1-36 months. No serious procedure-related adverse events were observed. Conclusion: Percutaneous pancreatic stent placement may be a viable option for patients with postoperative PJS in whom an endoscopic approach is not feasible. Metal stents may be considered over plastic stents for the management of PJS, considering the possible lower stent migration and infeasibility of frequent endoscopic stent exchange due to the altered anatomy.

Dosimetric Study Using Patient-Specific Three-Dimensional-Printed Head Phantom with Polymer Gel in Radiation Therapy

  • Choi, Yona;Chun, Kook Jin;Kim, Eun San;Jang, Young Jae;Park, Ji-Ae;Kim, Kum Bae;Kim, Geun Hee;Choi, Sang Hyoun
    • Progress in Medical Physics
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    • v.32 no.4
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    • pp.99-106
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    • 2021
  • Purpose: In this study, we aimed to manufacture a patient-specific gel phantom combining three-dimensional (3D) printing and polymer gel and evaluate the radiation dose and dose profile using gel dosimetry. Methods: The patient-specific head phantom was manufactured based on the patient's computed tomography (CT) scan data to create an anatomically replicated phantom; this was then produced using a ColorJet 3D printer. A 3D polymer gel dosimeter called RTgel-100 is contained inside the 3D printing head phantom, and irradiation was performed using a 6 MV LINAC (Varian Clinac) X-ray beam, a linear accelerator for treatment. The irradiated phantom was scanned using magnetic resonance imaging (Siemens) with a magnetic field of 3 Tesla (3T) of the Korea Institute of Nuclear Medicine, and then compared the irradiated head phantom with the dose calculated by the patient's treatment planning system (TPS). Results: The comparison between the Hounsfield unit (HU) values of the CT image of the patient and those of the phantom revealed that they were almost similar. The electron density value of the patient's bone and brain was 996±167 HU and 58±15 HU, respectively, and that of the head phantom bone and brain material was 986±25 HU and 45±17 HU, respectively. The comparison of the data of TPS and 3D gel revealed that the difference in gamma index was 2%/2 mm and the passing rate was within 95%. Conclusions: 3D printing allows us to manufacture variable density phantoms for patient-specific dosimetric quality assurance (DQA), develop a customized body phantom of the patient in the future, and perform a patient-specific dosimetry with film, ion chamber, gel, and so on.

The Study on Measurement of Relative Conversion Factor in X-ray Image Intensifier (X선영상증배관의 상대변환계수 측정에 관한 검토)

  • Kim, Sung-Chul;Shin, Sung-Ill;Lee, Sun-Sook;Huh, Joon;Kim, Sung-Soo
    • Journal of radiological science and technology
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    • v.20 no.2
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    • pp.28-33
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    • 1997
  • For the Evaluation of X-ray image intensifier, we measured radiation dose at input of I. I., brightness and fluorescence at output of I. I. by using X-ray exposure meter, optometer and fluorescence meter for the relative conversion factor. Especially, by using fluorescence meter, we could easily get relative conversion factor without having regulated machine by JIS. Since using, the quality of image intensifier is going down. Consequently, it needs continuous quality maintenance.

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