A new method and device of aligning patient setup lasers in radiation therapy

• DOI: 10.1120/jacmp.v17i1.5527
• Publication Date: 2017-02-28T00:23:13Z
• Authors: Ui‐Jung Hwang; Kwanghyun Jo; Young Kyung Lim; Jung Won Kwak; Sang Hyoun Choi; Chiyoung Jeong; Mi Young Kim; Jong Hwi Jeong; Dongho Shin; Se Byeong Lee; Jeong‐Hoon Park; Sung Yong Park; Siyong Kim
• Keywords: 03 medical and health sciences; 0302 clinical medicine; patient setup; laser alignment; radiation isocenter; optical alignment; star shot; Lasers; Neoplasms; Radiotherapy Planning, Computer-Assisted; Radiation Oncology Physics; Humans; Radiotherapy, Intensity-Modulated; Particle Accelerators; Radiotherapy Setup Errors

The aim of this study is to develop a new method align the patient setup lasers in radiation therapy treatment room and examine its validity efficiency. laser alignment realized by device composed both metallic base plate few acrylic transparent plates. Except one, every has either crosshair line (CHL) or single vertical that used for alignment. Two holders radiochromic film insertion are prepared find isocenter. right positions can be found optically matching shadows all CHLs gantry head device. reproducibility, accuracy, efficiency dependency on position error light source were evaluated comparing means standard deviations measured positions. After optical lasers, isocenter was collimator star shots, then translated parallel In reproducibility test, mean deviation wall mm whereas they conventional method. accuracy 1.4 method, 2.1 walls. test error, shifted just similar amount shift but it greatly magnified study, devised successfully. provided more accurate, reproducible, faster than PACS numbers: 87.56.Fc, 87.53.Bn, 87.53.Kn, 87.53.Ly, 87.55.Gh