A dosimetric study comparing three-, four-, and six- field plans for treatment of carcinoma of the prostate.
We present a three-dimensional dosimetric analysis of 3-, 4-, and 6-field plans using 24 MV photon beams for treatment of carcinoma of the prostate. We compare isodose distributions on a transverse plane through the center of the target as well as differential and integral dose volume histograms for the target and critical structures, respectively. An extensive study on a representative case led to the development of a technique where two complementary 3-field daily plans deliver the same daily target dose as the standard 4-field box while affording sparing of the bladder and rectum similar to that achieved with a 6-field plan. This technique was shown to yield the same results on a sample of four additional patients representing a range of target and patient sizes. We conclude that the combined two-day, 3-field method for treatment of the prostate may be a better choice than the standard 4-field box or the 6-field daily plan for dose escalation studies.
Haraf
D J
DJ
Department of Radiation and Cellular Oncology, University of Chicago, IL 60637.
Kuchnir
F T
FT
Watson-Bullock
S
S
Brachman
D
D
Doughtery
M
M
Rubin
S
S
Sutton
H
H
D006801:Humans; D008297:Male; D008722:Methods; D011471:Prostatic Neoplasms / Q000532:radiotherapy*; D011879:Radiotherapy Dosage