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The influence of applicator angle on dosimetry in vaginal vault brachytherapy

Hoskin, PJ; Bownes, P; Summers, A; (2002) The influence of applicator angle on dosimetry in vaginal vault brachytherapy. British Journal of Radiology , 75 (891) pp. 234-237.

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Abstract

In vaginal vault brachytherapy, the critical normal tissues are bladder and rectum, doses to these tissues may be affected by the position of a single line applicator placed in the vagina. Dosimetry with the applicator lying at its "natural" angle in the vagina with the patient in the lithotomy position has been compared with the applicator held horizontal as defined by a spirit level in 30 consecutive patients. A mean change in angle of 19.7degrees was found. This resulted in a mean decrease in ICRU (International Commission of Radiation Units and Measurements) rectal point dose when the applicator is horizontal of 12.9%, equivalent to a mean absolute dose reduction of 1.3 Gy for a prescription dose of 5.5 Gy at 5 mm depth. An increase in mean dose to the ICRU bladder point when the applicator is horizontal of 13.3%, equivalent to an absolute mean dose increase of 0.5 Gy per fraction for the same prescription dose. was also found. On the basis of these findings, it is recommended that vaginal vault brachytherapy is performed with a single line source held in the "corrected" horizontal position to reduce bowel dose as this is the most sensitive critical normal tissue

Type: Article
Title: The influence of applicator angle on dosimetry in vaginal vault brachytherapy
Additional information: Journal English Article BRITISH INST RADIOLOGY MAR 542XB LONDON Hoskin PJ Mt Vernon Hosp, Mt Vernon Ctr Canc Treatment, Rickmansworth Rd, Northwood HA6 2RN, Middx, England BRIT J RADIOL 36 PORTLAND PLACE, LONDON W1N 4AT, ENGLAND
Keywords: absolute, As, bladder, bowel, brachytherapy, British, cancer, critical, Depth, dose, DOSE-RATE BRACHYTHERAPY, Dosimetry, ENDOMETRIAL CARCINOMA, English, FRACTION, horizontal, INCREASE, IRRADIATION, LEVEL, LINE, May, measurement, MEASUREMENTS, MM, Patient, patients, POSITION, Prescription, radiation, Radiology, RD, Rectum, REDUCTION, sensitive, SINGLE, Spirit, Tissue, Tissues, treatment, unit, UNITS, vagina
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Cancer Institute
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Cancer Institute > Research Department of Oncology
URI: http://discovery.ucl.ac.uk/id/eprint/28585
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