NDLI: Dosimetric comparison of high-dose-rate brachytherapy and intensity-modulated radiation therapy as a boost to the prostate.

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Dosimetric comparison of high-dose-rate brachytherapy and intensity-modulated radiation therapy as a boost to the prostate.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Hermesse, Johanne Biver, Sylvie Jansen, Nicolas Lenaerts, Eric Nickers, Philippe
Description	Country affiliation: Belgium Author Affiliation: Hermesse J ( Department of Radiation Oncology, Liege University Hospital, Liege, Belgium. jhermesse@chu.ulg.ac.be)
Abstract	PURPOSE: We compared the dose conformity of two radiation modalities: high-dose-rate brachytherapy (HDR BT) and intensity-modulated radiation therapy (IMRT) to deliver a boost to the prostate after external beam radiotherapy (EBRT). METHODS AND MATERIALS: Ten successive patients with prostate adenocarcinoma treated with a single 10-Gy HDR BT boost after EBRT were investigated. Four theoretical IMRT plans were computed: (a) 32.85 Gy IMRT and (b) 26 Gy IMRT with CTV-PTV expansions, doses corresponding to the equivalent dose in 2-Gy fractions (EQD2) of one 10-Gy fraction calculated with a prostate alpha/beta ratio of respectively 1.5 and 3 Gy; and (c) 32.85 Gy IMRT and (d) 26 Gy IMRT without CTV-PTV expansions. The dose-volume histogram values converted in EQD2 with an alpha/beta ratio of 3 Gy for the organs at risk were compared. RESULTS: The HDR BT plan delivered higher mean doses to the PTV compared with IMRT plans. In all, 33% of the rectal volume received a mean dose of 5.32 +/- 0.65 Gy and 20% of bladder volume received 4.61 +/- 1.24 Gy with HDR BT. In comparison, doses delivered with IMRT were respectively 13.4 +/- 1.49 Gy and 10.81 +/- 4 Gy, even if only 26 Gy was prescribed to the PTV with no CTV-PTV expansion (p < 0.0001). The hot spots inside the urethra were greater with HDR BT but acceptable. CONCLUSIONS: Use of HDR BT produced a more conformal plan for the boost to the prostate than IMRT even without CTV-PTV expansions.
File Format	HTM / HTML
ISSN	03603016
Issue Number	1
Volume Number	76
e-ISSN	1879355X
Journal	International Journal of Radiation OncologyastBiologyastPhysics
Language	English
Publisher	Elsevier
Publisher Date	2010-01-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Radiology Brachytherapy Methods Prostatic Neoplasms Radiotherapy Radiotherapy Planning, Computer-assisted Radiotherapy, Intensity-modulated Algorithms Humans Male Movement Pathology Radiotherapy Dosage Rectum Radiation Effects Tumor Burden Urethra Urinary Bladder Comparative Study Journal Article
Content Type	Text
Resource Type	Article
Subject	Radiology, Nuclear Medicine and Imaging Cancer Research Radiation Oncology

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