2.Image Based Quality Assurance of Range Compensator for Proton Beam Therapy.
Jin Sung KIM ; Myonggeun YOON ; Dongwook KIM ; Young Kyung LIM ; Jungwon KWAK ; Soah PARK ; Dong Ho SHIN ; Jungwook SHIN ; Se Byeong LEE ; Sung Yong PARK ; Kwan Ho CHO
Korean Journal of Medical Physics 2008;19(1):35-41
The main benefit of proton therapy over photon beam radiotherapy is the absence of exit dose, which offers the opportunity for highly conformal dose distributions to target volume while simultaneously irradiating less normal tissue. For proton beam therapy two patient specific beam modifying devices are used. The aperture is used to shape the transverse extension of the proton beam to the shape of the tumor target and a patient-specific compensator attached to the block aperture when required and used to modify the beam range as required by the treatment plan for the patient. A block of range shifting material, shaped on one face in such a way that the distal end of the proton field in the patient takes the shape of the distal end of the target volume. The mechanical quality assurance of range compensator is an essential procedure to confirm the 3 dimensional patient-specific dose distributions. We proposed a new quality assurance method for range compensator based on image processing using X-ray tube of proton therapy treatment room. The depth information, boundaries of each depth of plan compensatorfile and x-ray image of compensator were analyzed and presented over 80% matching results with proposed QA program.
Humans
;
Proton Therapy
;
Protons
3.A Case of Proton Pump Inhibitor-responsive Esophageal Eosinophilia.
Joon Hui LEE ; Lee So MAENG ; Sang Yong KIM
The Korean Journal of Helicobacter and Upper Gastrointestinal Research 2015;15(3):200-202
No abstract available.
Eosinophilia*
;
Proton Pumps*
;
Protons*
4.Clinical Comparision of the ProTon and the Goldmann Applanation Tonometer.
Myung Chul SONG ; Han Mo KOO ; Nam Ho BAEK
Journal of the Korean Ophthalmological Society 1995;36(12):2188-2194
The recently developed ProTon tonometer is a small hand-held instrument which has less chances of infectious ocular diseases transmission and corneal abrasion than other types of tonometer. We compared the intraocular pressures taken by the ProTon tonometer with those by the Goldmann applanation tonometer in 290 eyes of 145 patients. The results were as follows: 1. The difference of the intraocular pressures between the ProTon tonometer and the Goldmann tonometer is less than 3mmHg in 91.03% of the estimation, and less than ImmHg in 64.83%. 2. The average intraocular pressure measured by the ProTon tonometer is lower than that by the Goldmann applanation tonometer. In the higher intraocular pressure zone, the difference of intraocular pressures between the two is more increased. 3. The correlation between the intraocular pressures measured by the ProTon tonometer and those by the Goldmann tonometer is very high(correlation coefficient 0.98). According to the above results, we conclude that the ProTon tonometer can be used more accurately and conveniently for both patient and examiner than other classic instruments.
Humans
;
Intraocular Pressure
;
Protons*
5.Proton pump inhibitor-induced fundic gland polyposis.
The Korean Journal of Internal Medicine 2017;32(1):197-198
No abstract available.
Proton Pumps*
;
Protons*
6.Metabolic Changes in Pericontusional Edematous Areas in Mild Head Injury Evaluated by Proton MRS.
Sang Su HONG ; Byung Chul SON ; Byung Gil CHOI ; Euy Nyeng KIM ; Bum Soo KIM ; Chun Kum PARK ; Bo Young CHOE ; Moon Chan KIM ; Joon Ki KANG
Journal of Korean Neurosurgical Society 2000;29(9):1233-1237
No abstract available.
Craniocerebral Trauma*
;
Head*
;
Protons*
7.A Monte Carlo Simulation Study of a Therapeutic Proton Beam Delivery System Using the Geant4 Code.
Jungwook SHIN ; Hyunha SHIM ; Jungwon KWAK ; Dongwook KIM ; Sungyong PARK ; Kwan Ho CHO ; Se Byeong LEE
Korean Journal of Medical Physics 2007;18(4):226-232
We studied a Monte Carlo simulation of the proton beam delivery system at the National Cancer Center (NCC) using the Geant4 Monte Carlo toolkit and tested its feasibility as a dose verification framework. The Monte Carlo technique for dose calculation methodology has been recognized as the most accurate way for understanding the dose distribution in given materials. In order to take advantage of this methodology for application to externalbeam radiotherapy, a precise modeling of the nozzle elements along with the beam delivery path and correct initial beam characteristics are mandatory. Among three different treatment modes, double/single.scattering, uniform scanning and pencil beam scanning, we have modeled and simulated the double.scattering mode for the nozzle elements, including all components and varying the time and space with the Geant4.8.2 Monte Carlo code. We have obtained simulation data that showed an excellent correlation to the measured dose distributions at a specific treatment depth. We successfully set up the Monte Carlo simulation platform for the NCC proton therapy facility. It can be adapted to the precise dosimetry for therapeutic proton beam use at the NCC. Additional Monte Carlo work for the full proton beam energy range can be performed.
Proton Therapy
;
Protons*
;
Radiotherapy
8.Is There Any Association of Osteoporosis With Proton Pump Inhibitor Use? (Gastroenterology 2010;138:896-904).
Journal of Neurogastroenterology and Motility 2010;16(3):335-336
No abstract available.
Osteoporosis
;
Proton Pumps
;
Protons
9.The Necessity of Validated Questionnaires: Determining Accurate Responses to Proton Pump Inhibitor Use.
Journal of Neurogastroenterology and Motility 2012;18(1):113-113
No abstract available.
Proton Pumps
;
Protons
10.Proton Magnetic Resonance Chemical Shift Imaging(1H-CSI)-directed Stereotactic Brain Biopsy.
Kyung Sool CHANG ; Byung Chul SON ; Moon Chan KIM ; Byung Gil CHOI ; Euy Neying KIM ; Bum Soo KIM ; Bo Young CHOE ; Hyun Man BAIK ; Yong Kil HONG ; Joon Ki KANG
Journal of Korean Neurosurgical Society 2000;29(12):1606-1611