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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Society of Radiology
Journal Basic Information
Journal DOI :
The Korean Society of Radiology (KSR)
Editor in Chief :
Volume & Issues
Volume 9, Issue 7 - Dec 2015
Volume 9, Issue 6 - Oct 2015
Volume 9, Issue 5 - Aug 2015
Volume 9, Issue 4 - Jun 2015
Volume 9, Issue 3 - Apr 2015
Volume 9, Issue 2 - Feb 2015
Volume 9, Issue 1 - Jan 2015
Selecting the target year
Accuracy Evaluation of Respiratory Air Flow Transducer for Artificial Ventilation
Lee, In-Kwang ; Park, Mi-Jung ; Kim, Kyoung-Ok ; Shin, Eun-Young ; Shon, Ho-Sun ; Cha, Eun-Jong ; Kim, Kyung-Ah ;
Journal of the Korean Society of Radiology, volume 9, issue 7, 2015, Pages 425~431
DOI : 10.7742/jksr.2015.9.7.425
Measurement accuracy was evaluated for the respiratory air flow transducer developed for applications under emergent situations. Pressure-Flow calibration equation was obtained by acquisition of air flow signals from the transducer in response to 6 flow waveforms, similar to those of artificial ventilation, generated by the standard flow generator system. Tidal volume and maximal flow rate were calculated on the flow signal then compared with the error-free data obtained by the linear displacement transducer of the flow generator system. Mean relative error of the tidal volume was within 3% and that of the maximal flow rate, approximately 5%, demonstrating accurate enough measurements. Therefore, the transducer could be applied to emergent situations to monitor the respiratory air flow signal as well as diagnostic parameters in real time.
Radiation Exposure Evaluation Depending on Radiation Workers' Locations during Dental Radiography
Jeong, Cheonsoo ; Kim, Jiyoung ;
Journal of the Korean Society of Radiology, volume 9, issue 7, 2015, Pages 433~438
DOI : 10.7742/jksr.2015.9.7.433
To evaluate the radiation exposure level based on radiation workers' locations in dental radiography, the radiation dose rate in the radiographic room, lead glass, and operation system was measured. To that end, various devices were used, such as a Standard(Max-GLS, Shinhung), a panorama (PCH-2500, Vatech), a cephalometric radiography (PCH-2500), and a cone beam CT (PHT-30LFO, Vatech), as well as a PM1405 equipment as a radiation meter. Radiography conditions were set the same as the factors used in the clinical setting. As the result, the cone beam CT turned out the highest with 98 uSv and the standard showed the lowest level with 0.4 uSv/h. The panorama was measured to be higher than the Cephalo due to its different focus mode. On the lead glass surface and in the operation stand, the oral radiography device, panoramic, and Cephalo all were measured below the recording level. However, the cone beam CT was measured to have the leakage dose. Thus, radiation involved workers should be equipped with appropriate protection tools and reduce radiography time as much as possible. In addition, the structure of the radiation chamber should be also designed efficiently. Dental radiography has continued to grow in recent years, so it is necessary take appropriate protection measures for patients and radiation workers.
The Fabrication and Property Evaluation of Poly-crystalline CdTe based Photon Counting X-ray Sensor
Kang, Sang Sik ; Park, Ji Koon ;
Journal of the Korean Society of Radiology, volume 9, issue 7, 2015, Pages 439~443
DOI : 10.7742/jksr.2015.9.7.439
An electrical signals of a conventional radiation medical imaging sensor are obtained by charge integration method. In this study, the polycrystalline cadmium telluride(p-CdTe) film was fabricated by a thermal evaporation method for the photon counting sensor development with excellent resolution in low exposure dose. From the fabricated p-CdTe sensor, the physical properties(SEM, XRD) and the electrical properties(leakage current, x-ray sensitivity, SNR) were evaluated. As a result, the leakage current of below
of the X-ray sensitivity were showed in below
. In addition, the signal to noise ratio showed the values of above 5000 at operating voltage.
The Study of Forward Scattering Dose according to the Thickness of Filter in General Radiography
Choi, Il Hong ; Kim, Kyo Tae ; Heo, Ye Ji ; Kang, Sang Sik ; Noh, Si Cheol ; Jung, Bong Jae ; Nam, Sang Hee ; Park, Ji Koon ;
Journal of the Korean Society of Radiology, volume 9, issue 7, 2015, Pages 445~448
DOI : 10.7742/jksr.2015.9.7.445
Recently there has been increasing interest in the filter to reduce the proportion of low-energy photons in the polychromatic X-ray, affect the quality of the image quality by X-ray hardening effect is a situation that has been overlooked. In this study, by evaluating the change in FSR based on the filter and it was quantitatively discuss scatter dose affecting the medical image quality. The results of the experiment, as the thickness of the filter is increased, up to 13.9%p, that tends to FSR increases appearance were evaluated. Based on these results, in compliance with the thickness of the filter that has been recommended in KS standard, even while reducing the radiation dose of the patient, in addition to the noise to about 1%p within the FSR only medical image the contribution to it is conceivable. Therefore, even while reducing radiation dose of the patient, in order to improve the quality of the medical image, the use of appropriate filter is considered important.
Usefulness Evaluation on the Treatment Plan of Tomotherapy and VMAT in Radiotherapy for Prostate Cancer
Heo, Kwangmyoung ; Han, Jaebok ; Choi, Namgil ;
Journal of the Korean Society of Radiology, volume 9, issue 7, 2015, Pages 449~457
DOI : 10.7742/jksr.2015.9.7.449
In this study, to evaluate the usefulness of the treatment plan of tomotherapy and volumetric modulated arc therapy (VMAT) in the radiotherapy for prostate cancer, the absorbed dose, dose volume histogram (DVH), treatment efficiency, and the results of dose verification accuracy using MapCHECK2 were compared and analyzed. Of the prostate cancer patients who underwent tomotherapy treatment in the Radiologic Oncology of H University Hospital between July 2014 and December 2014, 12 patients were randomly selected. As a result of analyzing the absorbed dose and DVH, both radiologic treatment plans showed slight differences in the treatment of the cancer tissues and the bladder, but the difference was in the error range of -5% to +3%, and did not exceed the side effect guideline or the tolerance dose limit. VMAT showed higher treatment efficiency than tomotherapy with a 2.5 times shorter treatment time and a 10.3 times less monitor unit (MU). Both showed 95% or higher dose accuracy satisfying the standard. VMAT showed 2.3% higher efficiency than tomotherapy. In both tomotherapy and VMAT, appropriate doses were absorbed for cancer tissues, and did not exceed the tolerance dose for normal tissues showing no significant difference in dose distribution. However, considering the shorter treatment time, lower total MU, and better treatment efficiency and dose verification accuracy, VMAT may be more useful than tomotherapy in cancer treatments.
Simulation of Energy Absorption Distribution using of Lead Shielding in the PET/CT
Jang, Dong-Gun ; Kim, Changsoo ; Kim, Junghoon ;
Journal of the Korean Society of Radiology, volume 9, issue 7, 2015, Pages 459~465
DOI : 10.7742/jksr.2015.9.7.459
Energy absorption distribution according to lead shielding for 511 keV
ray was evaluated using a Monte Carlo simulation in PET/CT. Experimental method was performed about the depth of skin surface(0.07), lens(3) and the depth(10) was conducted by using ICRU Slab phantom. Difference of energy absorption distribution according to lead thickness and effect of air gap according to distance of lead and phantom. As a result, study showed that using a lead shielding makes high energy distribution by backscatter electron. As a distance between lead and phantom increased, energy absorption distribution gradually decreased. 9 cm or more air gap should exist to prevent effect of backscatter electron which reaches skin surface, when 0.25 mmPb shielding is used. Also 1 cm or more air gap was needed to prevent the effect in 0.5 mmPb. If air gap was not concerned, 0.75 mm or more lead thickness was necessary to prevent effect of backscatter electron.
The Image Distortion Analysis of Levin-tube tip by Patient position and Incidence Angle when taking Mobile Chest AP Projection
Lee, Jinsoo ; Park, Hyonghu ;
Journal of the Korean Society of Radiology, volume 9, issue 7, 2015, Pages 467~471
DOI : 10.7742/jksr.2015.9.7.467
This study's purpose is improve image quality to keep accurate tube angle in order to recognize distortion degree conditions by patient's position or tube angle and to provide exact clinical informations when taking chest AP projection for patient which have L-tube in stomach. The experimental equipment was ELMO-T6S by SHIMADZU corporation, then we put L-tube which attached 1 mm gap scales ruler on chest phantom surface. The experiment set by 90 kVp, 4 mAs, 120 cm distance. Each phantom position which changed supine, 30degree, 45degree, 60degree on the table exposured direct,
to head and feet directions. As a result, L-tube tip's position was changed by patient's position and tube angle. When patient's position is supine, tip's position change was lower than 30degree, 45degree, 60degree. We have to adjust patient's position or tube angle in order to occur image distortion by fault tube angle when confirming correct position L-tube tip through chest x-ray. Also, Radiological technologist try to make accurate evaluation index for satisfied L-tube insertion.
Assessment of Entrance Surface Dose and Image Distortion in Accordance with Abdominal Obesity in the Chest Radiography
Kim, Boo Soon ; Park, Jeong Kyu ; Kwon, Soon Mu ;
Journal of the Korean Society of Radiology, volume 9, issue 7, 2015, Pages 473~478
DOI : 10.7742/jksr.2015.9.7.473
Abdominal obesity is one of the most influential index to predict of insulin resistance syndrome/metabolic syndrome in social demographic characteristics. It is matter of fact that radiation dose are increasing with development of medical treatment and device. In this study, we estimated distortion between reference image and entrance surface dose when take a chest radiography forward chest phantom assumed abdominal obesity. When angle of chest phantom incline
forward, thoracic transverse and longitudinal diameter increase 1.22% and 0.44% each. Also cardiac transverse diameter increase 1.01% and cardio-throracic ratio (CTR) decrease 0.27% in the same situation of incline to
forward. Thoracic transverse diameter shows the largest increase, and CTR was decreased. But entrance surface dose to phantom increase significantly 6.12% when angle of chest phantom incline
forward. In conclusion, we have to pay attention to accurate positioning, to prevent a distortion of image through incline, and make patients not to expose to additional radiation.
The effects of Upper Thoracic Joint Mobilization Technique using Kaltenborn-Evjenth concept on Cervicothoracic ROM and Pain in patients with Chronic Neck Pain
Jun, Young Wook ; So, Hyun Jeong ; Jeong, Youn Do ; Um, Sung Heum ;
Journal of the Korean Society of Radiology, volume 9, issue 7, 2015, Pages 479~486
DOI : 10.7742/jksr.2015.9.7.479
This study was conducted to investigate the effects of upper thoracic joint mobilization technique using Kaltenborn-Evjenth concept on the range of cervical and thoracic motion and pain in patients with chronic neck pain. The subjects were divided into a thoracic joint mobilization group(n=7) and a conservative physical therapy group(n=7). Each of the groups received thoracic joint mobilization or conservative physical therapy three times a week lasted for four weeks. The measurements were performed for the range of thoracic segmental motion(SpinalMouse), the pain(visual analogue scale) and the range of cervical joint motion(Inclinometer, Dualer IQ). They were made four times: before experiment, at 2weeks, 4weeks, and 4weeks after experiment.
Improvement in Reconstruction Time Using Multi-Core Processor on Computed Tomography
Chon, Kwon Su ;
Journal of the Korean Society of Radiology, volume 9, issue 7, 2015, Pages 487~493
DOI : 10.7742/jksr.2015.9.7.487
The reconstruction on the computed tomography requires much time for calculation. The calculation time rapidly increases with enlarging matrix size for improving image quality. Multi-core processor, multi-core CPU, has widely used nowadays and has provided the reduction of the calculation time through multi-threads. In this study, the calculation time of the reconstruction process would improved using multi-threads based on the multi-core processor. The Pthread and the OpenMP used for multi-threads were used in convolution and back projection steps that required much time in the reconstruction. The Pthread and the OpenMP showed similar results in the speedup and the efficiency.
A Study of Awareness of Nursery School Parents about Health Care Privatization
Choi, Kyung Nam ; Park, Yun ; Ahn, Byung ju ;
Journal of the Korean Society of Radiology, volume 9, issue 7, 2015, Pages 495~500
DOI : 10.7742/jksr.2015.9.7.495
Health care privatization will have a very significant impact on the quality of medical service and income redistribution and risk diversification. This study was conducted to improve the situation without too much insistence that one did not understand the essence rife about the privatization of health care. In this study, grasp the implications of the current health care debate to be privatized, and dealing with the claims accordingly. Seeks to help establish an objective perspective, looking at the pros and cons at the same time claims for medical privatization policy. The Health and diversification through the capitalist market access as part of the transition process is being overlooked as a new growth engine industries. But health care is constrained to follow the growth of universal access and how to deal with life because it is practical conduct of the person. In addition to services that are not only for the benefit of the profit or government institutions.
Contemplation on Usefulness of Plane Cone for Taking Image of Intercondyloid Fossa
Shin, WoonJae ;
Journal of the Korean Society of Radiology, volume 9, issue 7, 2015, Pages 501~508
DOI : 10.7742/jksr.2015.9.7.501
There are various Intercondyloid fossa X-ray taking methods. The methods carried out in clinics are Holmblad method, Camp-Conventry method, and Beclere method. Taking image of Intercondyloid fossa is carried a lot as basic examination for diagnosis related to simple fracture and cruciate ligament. Considering the condition and pains of patients, safe method is chosen but because Holmblad method can cause pains to knee part adhering to cassette, it is not easily used. In this study self-produced plane circular cone was attached to a cassette and in the posture for Holmblad method questionnaires of 100 applicants were analyzed to understand cognition on alleviation of pains, and the concentration of imge quality by scattering rays was measured with densitometer by taking human body phantom with X-ray. As a result, in the posture for Holmblad method, cognition on pains was alleviated by average 99%, and the change of concentration of X-ray film taken using phantom by scattering rays decreased statistically significantly compared to the cassette which did not use self-produced plane cone, therefor it is thought that the method can be valuably used in clinics.
Characteristic Changes Observation of N-isopropylacrylamide Phantom by Repeated Ultrasound Irradiation
Kim, Ju-Young ; Kim, Jae-Young ; Noh, Si-Cheol ; Choi, Heung-Ho ;
Journal of the Korean Society of Radiology, volume 9, issue 7, 2015, Pages 509~513
DOI : 10.7742/jksr.2015.9.7.509
In this study, we evaluated the thermal denaturation characteristics of reusable NIPAM tissue mimicking (TM) Phantom by measuring the thermal sensitivity. And the changes of acoustic characteristic and thermal denaturation shape in NIPAM TM phantom according to the number of re-use time and re-use period were observed. With the result, as the sonication time is increased, the sound velocity of NIPAM phantom was decreased by 100 m/s and the attenuation was increased slightly. However, the changes according to the re-use period was not observed. In the thermal denaturation shape and size observation by ultrasound sonicaton, the remarkable changes have not been confirmed. With the result of this study, NIPAM Phantom was considered appropriate to evaluate and predict the effect of therapeutic ultrasound by in repeated sonication test.
Stationary and Moving Computed Radiography Grids : Comparative Observer's Perception
Lee, Kiho ; Lee, Changhoon ; Jin, Gyehwan ;
Journal of the Korean Society of Radiology, volume 9, issue 7, 2015, Pages 515~521
DOI : 10.7742/jksr.2015.9.7.515
This study assessed the degradation of image quality caused by grid artifacts and
pattern artifacts in a stationary grid, and the degradation of image quality caused by cut off artifacts in a moving grid. X-ray images were acquired in a stationary grid and a moving grid with X-ray exposure conditions of 100 cm, 80 kVp, and 30 mA using a CDRAD phantom and a 24 cm thickness acrylic phantom. Observer's perception of X-ray imaging using CDRAD Analyzer was mean 49.36, standard deviation 3.76, maximum 55.56, and minimum 38.67 in the stationary grid, and 47.04, 12.69, 55.56, and 20.89, respectively, in the moving grid. The stationary grid was superior to the moving grid in terms of the mean and standard deviation of observer's perception.
Heating Characteristics Evaluation of Superposed Sonication Using Glycerol Tissue Mimic Phantom
Noh, Si-Cheol ; Kang, Sang-Sik ; Park, Ji-Koon ; Kim, Ju-Young ; Jung, Bong-Jae ;
Journal of the Korean Society of Radiology, volume 9, issue 7, 2015, Pages 523~528
DOI : 10.7742/jksr.2015.9.7.523
In this study, we evaluated the heating characteristics of single sonication and superposed two low-intensity ultrasonic sonication. Compare the results, the superposed sonication was showed a superior thermal effect than single sonication. And the maximum temperature was increased as 120-150%. The starting time of temperature rising has been shortened in superposed sonication. In addition, the time up to the maximum temperature has been shortened, too. In generally, as the ultrasonic intensity is higher, the more surface damage is occurred. However, in the case of superposed sonication, the same thermal effect had be confirmed without surface damage. Through the results of the study, we thought that the superposed sonication will be able to reduce the intensity of the ultrasonic treatment. And, by using the low-intensity, the more safe and more effect therapy will be possible in therapeutic ultrasound application.
VCUG Studies on the Clinical Usefulness of Aids
Choe, Dea yeon ; Kim, Dong hyun ;
Journal of the Korean Society of Radiology, volume 9, issue 7, 2015, Pages 529~533
DOI : 10.7742/jksr.2015.9.7.529
VCUG(Voiding Cystourethrography) study is being performed to check urinary reflex symptom from bladder to ureter or kidney in the method of filling the bladder with radiation opaque contrast agent. However, VCUG study have been performed impersonally, patients have to be naked and open their legs and then void. This method is so impersonal that it is immediately needed to improve the way of testing and crete new aid. Therefore, this study through producing underwear for VCUG, analysis and compares the test time of VCUG, patient radiation dose and patient satisfaction. The target of this study was 79 Male and Female patients who visited genitourinary clinic of PNUYH for their VCUG tests AXIUM Iconos R200(Siemens Medical System : Germany) and self-produced plastic underwears made by vinyl and plasic molding machine were used. The 79 patient were divided into two groups : experiment of patient and comparison group of we patient (using aid) in order to compare, testing time, DAP (dose area product) and patient satisfaction. There was time reduction, from 35.3min of comparison group to 27.8min experimentation group by 7.5min decrease. And comparison group of
(DAP) decreased experimental group (using aid) of
. In the case of patients satisfaction study, anxiety had a drop by 3.45 of comparison group to 2.51 experimentation group by 0.94 decrease. in experimental group. And shame had a drop by 4.02 of comparison group to 3.08 experimentation group by 0.94 increase. in experimental group. Difference of the smooth voiding had a drop by 1.90 of comparison group to 2.84 experimentation group by 0.94 increase. in experimental group. In addition satisfaction had a rise by 1.19 in experimental group. There were also other opinions of uncomfortableness on it and troublesome to wear. VCUG is one of the sensitive care required test. Therefore staff and the aid can give patients such comfortable and the aid can consentive on voiding. As a result test time and DAP can be reduced. It is needed to make testing at more comfortable for patients.
Variation of Image Quality and Dose by Applying Multi-Leaf Collimator for Digital Mammography
Kwon, Soon Mu ; Kim, Boo Soon ; Park, Hyung Jun ; Kang, Yeong Han ;
Journal of the Korean Society of Radiology, volume 9, issue 7, 2015, Pages 535~540
DOI : 10.7742/jksr.2015.9.7.535
Collimator has important functions with control primary X-ray that decrease radiation exposure dose for patients and reduce scatter ray and make better quality of image. But there are no regulations for X-ray mammography device of collimator, so widely used device adopt rectangularly controlled collimator. Though digital X-ray mammography device expand supply recently, rectangularly controlled collimator of film/screen mode still used. After searching for real condition of beam field with digital mammography, we made a multi-leaf collimator which is able to adjust the beam field in accordance with size and shape of breast, and we measuring up the transitions of image quality, average glandular dose(AGD) and, Dose area product(DAP). There are no significant differences between rectangularly controlled collimator and multi-leaf collimator, and DAP value decreased by 50.72%. As conclusion, there needs to expand the use of multi-leaf collimator for optimum adoption of beam field in digital mammography, and also need to develop an automatic regulation of beam field for reduce of exposure dose to patients.