Radiotherapy treatment planning of prostate cancer using magnetic resonance imaging alone.

2.50
Hdl Handle:
http://hdl.handle.net/10541/79055
Title:
Radiotherapy treatment planning of prostate cancer using magnetic resonance imaging alone.
Authors:
Lee, Young K; Bollet, Marc; Charles-Edwards, Geoffrey; Flower, Maggie A; Leach, Martin O; McNair, Helen A; Moore, Elizabeth; Rowbottom, Carl G; Webb, Steve
Abstract:
PURPOSE: Accurate anatomical delineation of the gross tumour volume (GTV) is crucial for effective radiotherapy (RT) treatment of prostate cancers. Although reference to pelvic magnetic resonance (MR) for improved delineation of the prostate is a regular practice in some clinics, MR has not replaced CT due to its geometrical distortions and lack of electron-density information. The possibility and practicality of using MR only for RT treatment planning were studied. MATERIALS AND METHODS: The addition of electron-density information to MR images for conformal radiotherapy (CRT) planning of the prostate was quantified by comparing dose distributions created on the homogeneous density- and bulk-density assigned images to original CT for four patients. To quantify the MR geometrical distortions measurements of a phantom imaged in CT (Siemens Somatom Plus 4) and FLASH 3D T1-weighted MR (1.5 T whole body Siemens Magnetom Vision) were compared. Dose statistics from CRT treatment plans made on CT and MR for five patient data were compared to determine if MR-only treatment plans can be made. RESULTS: The differences between dose-plans on bulk-density assigned images when compared to CT were less than 2% when water and bone values were assigned. Dose differences greater than 2% were observed when images of homogeneous-density assignment were compared to the CT. Phantom measurements showed that the distortions in the FLASH 3D T1-weighted MR averaged 2 mm in the volume of interest for prostate RT planning. For the CT and MR prostate planning study, doses delivered to the planning target volume (PTV) in CT and MR were always inside a 93-107% dose range normalised to the isocentre. Also, the doses to the organs-at-risk in the MR images were similar to the doses delivered to the volumes in the registered CT image when the organ volumes between the two images were similar. CONCLUSIONS: Negligible differences were observed in dose distribution between CRT plans using bone+water CT number bulk-assigned image and original CT. Also, the MR distortions were reduced to negligible amounts using large bandwidth MR sequence for prostate CRT planning. MR treatment planning was demonstrated using a large bandwidth sequence and bulk-assigned images. The development of higher quality, low distortion MR sequence will allow regular practice of this technique.
Affiliation:
Joint Department of Physics, Institute of Cancer Research and Royal Marsden NHS Trust, Downs Road, Sutton, Surrey SM2 5PT, UK.
Citation:
Radiotherapy treatment planning of prostate cancer using magnetic resonance imaging alone. 2003, 66 (2):203-16 Radiother Oncol
Journal:
Radiotherapy and Oncology
Issue Date:
Feb-2003
URI:
http://hdl.handle.net/10541/79055
DOI:
10.1016/S0167-8140(02)00440-1
PubMed ID:
12648793
Type:
Article
Language:
en
ISSN:
0167-8140
Appears in Collections:
All Christie Publications

Full metadata record

DC FieldValue Language
dc.contributor.authorLee, Young K-
dc.contributor.authorBollet, Marc-
dc.contributor.authorCharles-Edwards, Geoffrey-
dc.contributor.authorFlower, Maggie A-
dc.contributor.authorLeach, Martin O-
dc.contributor.authorMcNair, Helen A-
dc.contributor.authorMoore, Elizabeth-
dc.contributor.authorRowbottom, Carl G-
dc.contributor.authorWebb, Steve-
dc.date.accessioned2009-08-28T08:42:04Z-
dc.date.available2009-08-28T08:42:04Z-
dc.date.issued2003-02-
dc.identifier.citationRadiotherapy treatment planning of prostate cancer using magnetic resonance imaging alone. 2003, 66 (2):203-16 Radiother Oncolen
dc.identifier.issn0167-8140-
dc.identifier.pmid12648793-
dc.identifier.doi10.1016/S0167-8140(02)00440-1-
dc.identifier.urihttp://hdl.handle.net/10541/79055-
dc.description.abstractPURPOSE: Accurate anatomical delineation of the gross tumour volume (GTV) is crucial for effective radiotherapy (RT) treatment of prostate cancers. Although reference to pelvic magnetic resonance (MR) for improved delineation of the prostate is a regular practice in some clinics, MR has not replaced CT due to its geometrical distortions and lack of electron-density information. The possibility and practicality of using MR only for RT treatment planning were studied. MATERIALS AND METHODS: The addition of electron-density information to MR images for conformal radiotherapy (CRT) planning of the prostate was quantified by comparing dose distributions created on the homogeneous density- and bulk-density assigned images to original CT for four patients. To quantify the MR geometrical distortions measurements of a phantom imaged in CT (Siemens Somatom Plus 4) and FLASH 3D T1-weighted MR (1.5 T whole body Siemens Magnetom Vision) were compared. Dose statistics from CRT treatment plans made on CT and MR for five patient data were compared to determine if MR-only treatment plans can be made. RESULTS: The differences between dose-plans on bulk-density assigned images when compared to CT were less than 2% when water and bone values were assigned. Dose differences greater than 2% were observed when images of homogeneous-density assignment were compared to the CT. Phantom measurements showed that the distortions in the FLASH 3D T1-weighted MR averaged 2 mm in the volume of interest for prostate RT planning. For the CT and MR prostate planning study, doses delivered to the planning target volume (PTV) in CT and MR were always inside a 93-107% dose range normalised to the isocentre. Also, the doses to the organs-at-risk in the MR images were similar to the doses delivered to the volumes in the registered CT image when the organ volumes between the two images were similar. CONCLUSIONS: Negligible differences were observed in dose distribution between CRT plans using bone+water CT number bulk-assigned image and original CT. Also, the MR distortions were reduced to negligible amounts using large bandwidth MR sequence for prostate CRT planning. MR treatment planning was demonstrated using a large bandwidth sequence and bulk-assigned images. The development of higher quality, low distortion MR sequence will allow regular practice of this technique.en
dc.language.isoenen
dc.subjectProstatic Canceren
dc.subject.meshFeasibility Studies-
dc.subject.meshHumans-
dc.subject.meshMagnetic Resonance Imaging-
dc.subject.meshMale-
dc.subject.meshProstatic Neoplasms-
dc.subject.meshRadiometry-
dc.subject.meshRadiotherapy Planning, Computer-Assisted-
dc.subject.meshRadiotherapy, Conformal-
dc.subject.meshTomography, X-Ray Computed-
dc.subject.meshTreatment Outcome-
dc.titleRadiotherapy treatment planning of prostate cancer using magnetic resonance imaging alone.en
dc.typeArticleen
dc.contributor.departmentJoint Department of Physics, Institute of Cancer Research and Royal Marsden NHS Trust, Downs Road, Sutton, Surrey SM2 5PT, UK.en
dc.identifier.journalRadiotherapy and Oncologyen

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