EVALUATION OF HEAD HOLDER EFFECT ON REDUCTION OF GEOMETRIC ERRORS IN RADIOTHERAPY OF HEAD AND NECK FIELDS IN RADIOTHERAPY DEPARTMENT OF IMAM HOSPITAL

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ALAHVERDI M.; MESBAHI A.; ATARI M.; KAZEMIAN A.; GHARAATI H.

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Journal: IRANIAN JOURNAL OF MEDICAL PHYSICS Year:2003 | Volume:1 | Issue:1 Page(s): 1-7

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Title

EVALUATION OF HEAD HOLDER EFFECT ON REDUCTION OF GEOMETRIC ERRORS IN RADIOTHERAPY OF HEAD AND NECK FIELDS IN RADIOTHERAPY DEPARTMENT OF IMAM HOSPITAL

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Keywords

RADIOTHERAPYQ3

GEOMETRIC ERRORSQ3

FIELD PLACEMENT ERRORQ4

HEAD HOLDERQ4

PORTAL FILMQ4

Abstract

In Radiation therapy, GEOMETRIC ERRORS are the major factors which influence the geometric reproducibility during the treatment course. The whole effect these GEOMETRIC ERRORS referred as FIELD PLACEMENT ERROR (FPE) and can be detected and measured using RADIOTHERAPY PORTAL FILM. Head and neck fields are susceptible for occurrence of these errors due to the mobility of head. Complete fixation is needed for, reducing of GEOMETRIC ERRORS. In the present research we designed ahead holder in, our department and the; GEOMETRIC ERRORS without; and with .our homemade. HEAD HOLDER was measured and estimated. A HEAD HOLDER was designed and made, from Perspex. For PORTAL FILMing a conventional radiography film and cassette with a 1 mm copper front screen were used. Two groups of patient were selected. Eight patients for first phase and 6 patients were considered. For each patient 1 simulation 5 PORTAL FILMs were taken. The FIELD PLACEMENT ERRORs were measured by comparing simulation and PORTAL FILMs. In patients who treated without HEAD HOLDER the average GEOMETRIC ERRORS along the X and Y-axis were 11.2 and 9.5 mm respectively. The standard deviation of GEOMETRIC ERRORS distribution was 9.9 and 7.8 mm along the X and Y respectively. Using HEAD HOLDER average GEOMETRIC ERRORS were reduced to 4.7 and 5.4 mm along the X, Y-axis respectively. The standard deviation of GEOMETRIC ERRORS distribution was 4.2 and 4.3 mm along the X and Y respectively. Considering the 5 mm as a maximum acceptable error, 63.6% and 26% error were estimated for the without and with holder patients respectively. According to the results of this study use of HEAD HOLDER and PORTAL FILMing is recommended for reducing of GEOMETRIC ERRORS treatment of head and neck fields. For decreasing the GEOMETRIC ERRORS to standard values, controlling and optimizing of all factors are essential.

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APA: Copy

ALAHVERDI, M., MESBAHI, A., ATARI, M., KAZEMIAN, A., & GHARAATI, H.. (2003). EVALUATION OF HEAD HOLDER EFFECT ON REDUCTION OF GEOMETRIC ERRORS IN RADIOTHERAPY OF HEAD AND NECK FIELDS IN RADIOTHERAPY DEPARTMENT OF IMAM HOSPITAL. IRANIAN JOURNAL OF MEDICAL PHYSICS, 1(1), 1-7. SID. https://sid.ir/paper/96867/en

Vancouver: Copy

ALAHVERDI M., MESBAHI A., ATARI M., KAZEMIAN A., GHARAATI H.. EVALUATION OF HEAD HOLDER EFFECT ON REDUCTION OF GEOMETRIC ERRORS IN RADIOTHERAPY OF HEAD AND NECK FIELDS IN RADIOTHERAPY DEPARTMENT OF IMAM HOSPITAL. IRANIAN JOURNAL OF MEDICAL PHYSICS[Internet]. 2003;1(1):1-7. Available from: https://sid.ir/paper/96867/en

IEEE: Copy

M. ALAHVERDI, A. MESBAHI, M. ATARI, A. KAZEMIAN, and H. GHARAATI, “EVALUATION OF HEAD HOLDER EFFECT ON REDUCTION OF GEOMETRIC ERRORS IN RADIOTHERAPY OF HEAD AND NECK FIELDS IN RADIOTHERAPY DEPARTMENT OF IMAM HOSPITAL,” IRANIAN JOURNAL OF MEDICAL PHYSICS, vol. 1, no. 1, pp. 1–7, 2003, [Online]. Available: https://sid.ir/paper/96867/en

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