Hong-Ryang Jung

A study on the correlation between patients' physical characteristics and effective dose of liver computed tomography.

This suggests indicators to be considered in the protocol for setting up equipment and minimizing patient doses by identifying the effective dose and correlations of each equipment company according to a patients body characteristics in liver CT. The study was conducted with 445 patients who went to the hospital and received liver CT at the diagnostic radiology department of S medical center from 2010 January to June. As the statistical methods, t-test, one-way ANOVA, and Pearsons correlation analysis were used. The study results show that as height, weight, and BMI increased, the effective dose increased with all equipment vendors. Correlations between a patients body characteristics and the effective dose were shown to be positive with all equipment vendors in regard to weight, BMI, and height, in order.

Research of Job Satisfaction in Radiation Therapy Technologist

This study Seoul, Kyonggi area hospital and data were collected from 211 people in radiation therapy technologist. The collected data were analyzed by using SPSS 17 version, For verification of the differences among groups, coefficient of Pearson was executed. It was composed of social demographic characteristics, Job stress and the impact the organization effectiveness and reliability analysis of factors. Organization culture and self leadership of each of the types to classify the results of conducted analysis factors are as follows: And the difference in the gender, age, and satisfaction with the Organization. Organization commitment and working in accordance with each part working experience is different. Radiation therapy duties analysis results of correlation between the uniqueness. Job satisfaction(p

Comparison Measurement Error of T-score Between Lumbar and Femoral Neck According to Kind of DXA

In this study, three different devices, Norland, Osteocore and Lunar were used to compare and analyze the measurement error by each bone density measurement device by classifying the physical characteristics into age, height and weight, the subject of total 300 sampling 100 persons for each device. Categorizing Lumbar region and Femoral neck as normal (T-score-1.0), osteopenia (-1.0>T-score>-2.5) and osteoporosis (T-score-2.5), the findings were observed as follows. Norland device showed the least measurement error in age and height, while Lunar showed the least in weight among the devices. And, the result of comparing the bone density measurement error based on the lumbar region showed that all of Lunar, Norland and Osteocore have the least variation of measurement error in osteopenia and the result of comparing based on the femoral neck showed that all of Lunar, Norland and Osteocore have the least variation of measurement error in osteoporosis. For each variable, the measurement error was observed to be vary upon the device. To solve this, standardized common Phantom should be used to compare and converge the measured value of each company and cross-calibration would be necessary when replacing the software.

Evaluating lead thickness for Shielding during Computed tomography using Monte Carlo Simulation

The objective of this study was to determine the appropriate thickness of lead shielding for computerized tomography (CT) and mock estimate the transmission spectrum according to changes in lead thickness based on computational simulation of CT apparatus. Based on the technical manual of the CT equipment company, CT device configuration was simulated with Monte Carlo simulation code. As shielding material for CT, lead, the most used one, was selected. Lead thickness was simulated by setting it from 0 (absence of shielding material) to 1.25 mm. With increasing lead thickness, the probability of photon absorption was increased while transmittance was estimated to be reduced. In addition, photon permeability was estimated to be 50% or less with lead thickness of 0.05 mm. However, photon absorption probability was estimated to be 90% or more with lead thickness of 0.375 mm with 10%. In computational simulation transmittance experiment of computed tomography using Monte Carlo simulated code, the appropriate lead thickness of the shield was found to be 0.5 mm.

A Study on the Usefulness of 3D Imaging in Micro-CT for Observing the Microstructure of Mice

본 연구는 실시간 동적영상(Real-time dynamic image)을 획득할 수 있는 고해상도 엑스선 영상장치인 마이크로 CT 을 이용하여 흰쥐의 미세 혈관구조를 관찰함은 물론 국내 원광 방사선영상 과학연구 센터에서 개발한 마이크로 CT 에 대한 유용성을 알아보고자 한다. 흰쥐 몸 전체의 2D 영상을 얻은 후 MIP(maximum intensity projection), VRT(volume rendering technique)기법을 이용하여 혈관구조의 조영된 3D 영상을 얻을 수 있었고 이 3D 혈관 영상을 머리, 복부, 심장과 몸 전체의 혈관시스템으로 각각 분류하였다. 【In this thesis we observe microvascular structure in mice by using micro-computed tomography (CT), which is high-resolution X-ray imaging equipment that can acquire Real-time dynamic image, and it aims to investigate the usefulness of micro-CT developed by Institute for Radiological Imaging Science Wonkwang University School of Medicine. After acquiring the systemic images of rats, contrast-enhanced 3D images of vascular structures could be acquired by using Maximum Intensity Projection (MIP) and Volume Rending Technique (VRT), This was divided into each vascular system of head, abdomen and heart and systemic vascular system.】

A Study on the Mitigation of the Exposure Dose Applying Bolus Tracking in Brain Perfusion CT Scan

급성기 허혈성 뇌졸중 증상이 있는 뇌 관류 CT 검사를 시행한 환자를 대상으로 장비사가 제시한 고정 시간 기법(Fixed time technique)과 조영제 추적 기법(Bolus tracking technique)을 비교하여 환자의 피폭선량을 분석하고자 하였으며, 조영제 추적 기법의 유용성과 최적의 조영증강 구간을 구현하는 Time graph를 알아보기 위한 것이다. 환자에서는 PCT의

Distortion of Magnetic Resonance Imaging for Different Types of Orthodontic Material

CTDI_{VOL}

Evaluation of the Reproducibility of Radiation Output from Diagnostic X-ray Equipment(Standards Based on IEC 60601-2-54)

은 고정시간기법에서 431.72mGy, Bolus tracking에서 323.61mGy로 측정되었고, DLP값은 고정시간기법에서

Analysis of Body Mass Index on Set Up Errors Rectal Cancer in Radiotherapy

1243.47mG y{\cdot}cm

The Study for Radio Protection According to a Possible Danger of Exposure During dental X-ray Examination

, Bolus tracking에서