DETERMINATION OF GEOMETRIC ACCURACY IN RADIOTHERAPY OF HEAD AND NECK AND PELVIS FIELDS BY PORTAL RADIOGRAPHY

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MESBAHI A.; SHOKRANI P.

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Journal: IRANIAN JOURNAL OF MEDICAL PHYSICS Year:2003 | Volume:1 | Issue:1 Page(s): 31-35

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Title

DETERMINATION OF GEOMETRIC ACCURACY IN RADIOTHERAPY OF HEAD AND NECK AND PELVIS FIELDS BY PORTAL RADIOGRAPHY

Author(s)

MESBAHI A. | SHOKRANI P. | Issue Writer Certificate

Keywords

DOSIMETRYQ3

RADIOTHERAPYQ3

PORTAL FILMQ4

PLACEMENT ERRORQ4

SIMULATOR FILMQ4

Abstract

The major goal of radiation therapy is the delivery of a prescribed radiation to target volume and preserving normal tissue. There are several geometric factors, which tend to compromise this goal. Geometric errors (field PLACEMENT ERRORs) cause the treatment fields not to be reproducible during the treatment course. In this study geometric errors of RADIOTHERAPY fields determined by PORTAL FILMs. Proper film and thickness of cassette front screen to produce the highest contrast were selected in RADIOTHERAPY by CO60 gamma rays and 12MV X-rays. 20 patients with head and neck and pelvis region tumors were chosen for our study. On average 4 PORTAL FILMs were taken for each patient during their treatment course. A total of 82 PORTAL FILMs were obtained. For each patient PORTAL FILMs compared with the SIMULATOR FILM and fields PLACEMENT ERROR were measured for each case. Average systematic and random errors as well as angle of rotation were calculated. The Calculated values were 10.3±6.8 mm along X-axis, 11.3± 13 along Y-axis and angle of rotation was 3.8±3.9. Field PLACEMENT ERRORs, considering 5 mm as a tolerance limit was 60% along X-axis and 64% along Y-axis. Results of this study shows that systematic and random errors were higher than values previously suggested by other investigations. The problem seems to exist due to lack of immobilization devices, positioning lasers and portal imaging.

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APA: Copy

MESBAHI, A., & SHOKRANI, P.. (2003). DETERMINATION OF GEOMETRIC ACCURACY IN RADIOTHERAPY OF HEAD AND NECK AND PELVIS FIELDS BY PORTAL RADIOGRAPHY. IRANIAN JOURNAL OF MEDICAL PHYSICS, 1(1), 31-35. SID. https://sid.ir/paper/96869/en

Vancouver: Copy

MESBAHI A., SHOKRANI P.. DETERMINATION OF GEOMETRIC ACCURACY IN RADIOTHERAPY OF HEAD AND NECK AND PELVIS FIELDS BY PORTAL RADIOGRAPHY. IRANIAN JOURNAL OF MEDICAL PHYSICS[Internet]. 2003;1(1):31-35. Available from: https://sid.ir/paper/96869/en

IEEE: Copy

A. MESBAHI, and P. SHOKRANI, “DETERMINATION OF GEOMETRIC ACCURACY IN RADIOTHERAPY OF HEAD AND NECK AND PELVIS FIELDS BY PORTAL RADIOGRAPHY,” IRANIAN JOURNAL OF MEDICAL PHYSICS, vol. 1, no. 1, pp. 31–35, 2003, [Online]. Available: https://sid.ir/paper/96869/en

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