The Image Distortion Analysis of Levin-tube tip by Patient position and Incidence Angle when taking Mobile Chest AP Projection

Mobile Chest AP 검사 시 환자자세와 입사각도에 따른 Levin-tube tip의 영상왜곡 분석

Lee, Jinsoo;Park, Hyonghu

  • Received : 2015.10.16
  • Accepted : 2015.12.25
  • Published : 2015.12.31


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, ${\pm}5degree$, ${\pm}10degree$, ${\pm}15degree$ 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.


L-Tube;Image Distortion Analysis;Mobile Chest Examination


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