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강성희,정진범,송창훈,엄근용,김인아,김재성,서태석 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.74 No.4
The purpose of this study is to evaluate the performance of a \stealth chamber" as a novel reference detector for measuring the commissioning beam data for a wedge eld. The stealth chamber is a transmission ionization chamber intended to be used as a reference chamber for relative dosimetry. The percentage depth doses (PDDs) and the dose proles of 6-, 8-, and 10-MV photon beams of four wedge lters were measured using the stealth and the CC13 chambers as reference detectors. The PDD and the prole measurements were performed under various eld sizes ranging from 4 4 cm2 to 20 20 cm2. For the evaluate of the performance of the stealth chamber in elds with a physical wedge, all measurement data obtained using the stealth chamber as a reference detector were compared with those measured using two CC13 chambers as both eld and reference detectors. For the PDDs, the dierences in dosimetric parameters such as the depth of maximum dose (dmax) and the PDD at 10 cm (D10) and 5 cm (D5) were analyzed for both reference detectors. In addition, the root-mean-square error (RMSE) was calculated to measure the agreement of the proles at dmax and a 10 cm depth. The percentage dierences in D10 and D5 between both detectors were less than 1% for all energies and elds with four wedges. Furthermore, the RMSEs of the proles at dmax and 10-cm depth in both chambers were within 1% for all energies and elds except for the 60 wedge angle. This study found that the use of a stealth chamber to measure the commissioning beam data for a wedge eld is feasible, although a relatively large dierence in the PDD was observed in the build-up region. However, we recommend careful verication of the PDDs and dose proles for large eld size and wedge angle before clinical use.
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Preparation and Patient Evaluation for Safe Gastrointestinal Endoscopy
강성희,현종진 대한소화기내시경학회 2013 Clinical Endoscopy Vol.46 No.3
Patient evaluation and preparation is the first and mandatory step to ensure safety and quality of endoscopic procedures. This begins and ends with identifying the patient, procedure type, and indication. Every patient has the right to be fully informed about risks and benefits of what is to be performed on them, and the medical personnel should respect the decision made by the patients. Thoroughly performed history taking and physical examination will guide the endoscopists to better stratify risk and plan sedation. Special attention should be given to higher-risk patients with higher-risk condition undergoing higher-risk procedures. Making preparations to monitor the patients and being ready to handle emergency situations throughout the endoscopic procedure are sine qua non to warrant safe endoscopy.
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