PMID: 9524607Apr 3, 1998Paper

Errors in positioning the patient during transcutaneous radiotherapy of the pelvis

La Radiologia medica
L F Cazzaniga, M Frigerio

Abstract

Quality controls in radiotherapy allow to check the correct running of treatment units and to test our procedures. Portal films taken during the first treatment session are used in quality assurance programs to compare scheduled to administered doses. To analyze the accuracy of patient positioning in pelvic cancer irradiation, a retrospective study was carried out on 50 treatment schedules carried out at the Radiotherapy Department of S. Anna Hospital (Como, Italy) from June to December, 1996. We checked field mispositioning for correlations with patient or treatment variables, such as patient age, sex, weight, thickness, or unit type. We took one portal film at the first treatment session and checked field positioning by measuring the distance of the isocenter from fixed anatomical structures on the simulation film and on the portal film taken in anteroposterior and lateral projections. Four vectors were defined to evaluate field mispositioning along right-left (ADS), craniocaudal (ACC, LCC) and anteroposterior (AP) directions. The average values of these four vectors were respectively 2.94, 5.23, 5.54 and 3.20 mm. We found a major shift in field centering leftward and toward the patient's feet. To obtain more information abou...Continue Reading

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