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서규석,임동원,진상호,신태석 대한마취과학회 1972 Korean Journal of Anesthesiology Vol.5 No.2
At the Kyung Hee Medical Center all patients receiving general anesthesia in the operating room are monitored continuously with electrocardioscope, Burdick CS-515 Monitor, and recorded by EK4S ECG. Among 50 patients 18 cases (36%) developed a variety of arrhythmias. Seven (14%) were considered serious in nature, such as ventricular extrasystoles. There was an increased incidence of arrhythmias during induction of anesthesia, in old age group and in poor risk patients. Continuous cardiac monitoring is valuable, easy, and practical in virtually all instances during anesthesia and surgery.
서규석,김종원,김찬형 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.4
If the proton therapy modality allowing excellent dose localization to the tumor volume and negligible exit dose in the patient is to be taken advantage of, a proper dosimetry system is required. We have recently designed a prompt-gamma scanning system to measure the proton range in situ by using a Monte Carlo technique employing MCNPX, FLUKA, and SabrinaTM. The gamma scanning system was designed to measure only the right-angled prompt gammas passing through a narrow collimation hole in order to correlate the position with the dose distribution. The collimation part of the scanning system, which has been constructed to measure the gammas at a 70-MeV proton energy, is made of a set of paraffin, borated carbon, and lead layers to shield the high-energy neutrons and secondary photons. However, in this study, we tried a titanium-hydride (TiH2) layer instead of the paraffin to reduce the background radiation. Our result shows that titanium hydride gives a better result when the distance between the phantom and the gamma scanner is short.