Faculty Collaboration Database

Practical approach to electron beam dosimetry at extended SSD. Phys Med Biol 1997 Aug;42(8):1505-14

Date

08/01/1997

Pubmed ID

9279902

DOI

10.1088/0031-9155/42/8/003

Scopus ID

2-s2.0-0030875108 (requires institutional sign-in at Scopus site)   27 Citations

Abstract

This paper presents a practical approach to clinical dosimetry for electron beams at extended source-to-surface distance (SSD). Characteristics of electron beams from a Siemens MD-2 accelerator are presented at a nominal SSD of 100 cm and an extended SSD of 115 cm. Relative output factors are measured at both 100 and 115 cm SSDs for a range of square field sizes for each beam energy. The change of output with SSD does not follow the inverse square law, if the nominal SSD is used. This deviation is larger for lower beam energy and smaller field sizes. An effective SSD, SSDeff, has been determined at dmax for each beam energy as a function of field size. A comprehensive approach to treatment time calculations is proposed.

Author List

Cygler J, Li XA, Ding GX, Lawrence E

MESH terms used to index this publication - Major topics in bold

Electrons
Models, Theoretical
Particle Accelerators
Phantoms, Imaging
Radiotherapy Dosage