The design and evaluation of a phantom for the audit of the treatment chain for prostate radiotherapy.

2.50
Hdl Handle:
http://hdl.handle.net/10541/84095
Title:
The design and evaluation of a phantom for the audit of the treatment chain for prostate radiotherapy.
Authors:
Perrin, Bruce A; Jordan, Thomas J; Hounsell, Alan R
Abstract:
BACKGROUND AND PURPOSE: A phantom has been designed and built for a multi-institutional technique audit of the planning and delivery for radiotherapy to the prostate. The phantom was designed to test both the geometric and dosimetric accuracy of each aspect of the process. MATERIALS AND METHODS: The phantom consists of two curved water filled perspex tanks either side of a central block of solid water equivalent material. There are two options for the central section; a target defining block and a dose measurement block. The target defining block uses air holes to define a 3-D target volume for imaging via a CT scanner or a simulator. These holes can subsequently be filled with steel pins to allow megavoltage imaging. The dose measurement block allows thimble chamber measurements to be made at pre-selected points in a 5x5mm array. Five dose measurement points, typical for a prostate planning target volume (PTV) were selected. Initial evaluation of the phantom was performed by auditing the prostate radiotherapy planning and treatment chain at one institution. RESULTS: Agreement between the phantom and planned geometry confirmed that the stages of image acquisition, transfer and manipulation were accurately performed. Agreement within 0.5% was found between phantom and water tank measurements for dose calibration at a reference point. The measured dose delivered was within 2% of the dose calculated by the planning computer for all of the selected measurement points. The target volume marked by the steel pins was visible using electronic portal imaging. CONCLUSIONS: The phantom is a useful tool for the technique audit of prostate radiotherapy.
Affiliation:
North Western Medical Physics, Christie Hospital NHS Trust, Wilmslow Road, Withington, Manchester, M20 4BX, UK.
Citation:
The design and evaluation of a phantom for the audit of the treatment chain for prostate radiotherapy. 2001, 60 (1):37-43 Radiother Oncol
Journal:
Radiotherapy and Oncology
Issue Date:
Jul-2001
URI:
http://hdl.handle.net/10541/84095
PubMed ID:
11410302
Type:
Article
Language:
en
ISSN:
0167-8140
Appears in Collections:
All Christie Publications

Full metadata record

DC FieldValue Language
dc.contributor.authorPerrin, Bruce Aen
dc.contributor.authorJordan, Thomas Jen
dc.contributor.authorHounsell, Alan Ren
dc.date.accessioned2009-10-12T16:16:58Z-
dc.date.available2009-10-12T16:16:58Z-
dc.date.issued2001-07-
dc.identifier.citationThe design and evaluation of a phantom for the audit of the treatment chain for prostate radiotherapy. 2001, 60 (1):37-43 Radiother Oncolen
dc.identifier.issn0167-8140-
dc.identifier.pmid11410302-
dc.identifier.urihttp://hdl.handle.net/10541/84095-
dc.description.abstractBACKGROUND AND PURPOSE: A phantom has been designed and built for a multi-institutional technique audit of the planning and delivery for radiotherapy to the prostate. The phantom was designed to test both the geometric and dosimetric accuracy of each aspect of the process. MATERIALS AND METHODS: The phantom consists of two curved water filled perspex tanks either side of a central block of solid water equivalent material. There are two options for the central section; a target defining block and a dose measurement block. The target defining block uses air holes to define a 3-D target volume for imaging via a CT scanner or a simulator. These holes can subsequently be filled with steel pins to allow megavoltage imaging. The dose measurement block allows thimble chamber measurements to be made at pre-selected points in a 5x5mm array. Five dose measurement points, typical for a prostate planning target volume (PTV) were selected. Initial evaluation of the phantom was performed by auditing the prostate radiotherapy planning and treatment chain at one institution. RESULTS: Agreement between the phantom and planned geometry confirmed that the stages of image acquisition, transfer and manipulation were accurately performed. Agreement within 0.5% was found between phantom and water tank measurements for dose calibration at a reference point. The measured dose delivered was within 2% of the dose calculated by the planning computer for all of the selected measurement points. The target volume marked by the steel pins was visible using electronic portal imaging. CONCLUSIONS: The phantom is a useful tool for the technique audit of prostate radiotherapy.en
dc.language.isoenen
dc.subjectProstatic Canceren
dc.subject.meshHumans-
dc.subject.meshMale-
dc.subject.meshMedical Audit-
dc.subject.meshMulticenter Studies as Topic-
dc.subject.meshPhantoms, Imaging-
dc.subject.meshProstatic Neoplasms-
dc.subject.meshRadiotherapy-
dc.subject.meshRadiotherapy Dosage-
dc.subject.meshRadiotherapy Planning, Computer-Assisted-
dc.titleThe design and evaluation of a phantom for the audit of the treatment chain for prostate radiotherapy.en
dc.typeArticleen
dc.contributor.departmentNorth Western Medical Physics, Christie Hospital NHS Trust, Wilmslow Road, Withington, Manchester, M20 4BX, UK.en
dc.identifier.journalRadiotherapy and Oncologyen

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