Journal article
Depth dose characteristics of 24‐MV x‐ray beams at extended SSD
Medical physics (Lancaster), Vol.18(2), pp.292-294
03/1991
DOI: 10.1118/1.596673
PMID: 1904530
Abstract
Depth dose characteristics of 24‐MV beams from a medical linear accelerator at various SSDs have been measured. The dose buildup, percent depth dose (PDD), and output were measured using ionization chambers and a diode detector under full scatter. Surface dose ranged from 8% to 51% depending upon the collimator setting at 100‐cm SSD. It decreased by 10%–15% as distance was increased to 200 cm, but remained unchanged beyond this distance. The d
max migrated rapidly toward the surface with increasing field size at 100‐cm SSD. At extended SSD, the d
max occurred at greater depths and shifted a little toward the shallow depths with increasing field size. Large field PDDs measured at extended SSD agreed well with those predicted from 100‐cm data. The output followed the 1/(distance)2 relationship quite well. The extended SSD beam data are clinically useful when treating hemibody or performing total body irradiation (TBI) procedures.
Details
- Title: Subtitle
- Depth dose characteristics of 24‐MV x‐ray beams at extended SSD
- Creators
- Shirish K Jani - Division of Radiation Oncology, The University of Iowa College of Medicine, Iowa City, Iowa 52242Edward C Pennington - Division of Radiation Oncology, The University of Iowa College of Medicine, Iowa City, Iowa 52242
- Resource Type
- Journal article
- Publication Details
- Medical physics (Lancaster), Vol.18(2), pp.292-294
- DOI
- 10.1118/1.596673
- PMID
- 1904530
- ISSN
- 0094-2405
- eISSN
- 2473-4209
- Number of pages
- 3
- Date published
- 03/1991
- Academic Unit
- Radiation Oncology
- Record Identifier
- 9984047882502771
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