Appropriate patient instructions can reduce prostate motion
<p>Abstract</p> <p>Background</p> <p>Interfraction prostate motion must be compensated by increased safety margins. If filling status of rectum and bladder is constant, motion should be reduced. We attempted to reduce interfraction motion errors by proper patient instru...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
BMC
2012-08-01
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| Series: | Radiation Oncology |
| Subjects: | |
| Online Access: | http://www.ro-journal.com/content/7/1/125 |
| _version_ | 1817990605996818432 |
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| author | Graf Reinhold Boehmer Dirk Nadobny Jacek Budach Volker Wust Peter |
| author_facet | Graf Reinhold Boehmer Dirk Nadobny Jacek Budach Volker Wust Peter |
| author_sort | Graf Reinhold |
| collection | DOAJ |
| description | <p>Abstract</p> <p>Background</p> <p>Interfraction prostate motion must be compensated by increased safety margins. If filling status of rectum and bladder is constant, motion should be reduced. We attempted to reduce interfraction motion errors by proper patient instruction.</p> <p>Method</p> <p>In 38 patients pairs of radio-opaque fiducial markers were implanted prior to definitive radiotherapy. Patients were positioned either according to skin marks or infrared body marker. We measured prostate displacement, i.e. pelvic bones versus intraprostatic marker position, via ExacTrac (two orthogonal radiographies) in 1252 fractions. Systematic and random setup and displacement errors were determined and safety margins estimated.</p> <p>Results</p> <p>In our study interfraction prostate displacement is < 1 mm in RL direction, and < 2 mm in AP and SI direction. Systematic errors are slightly below random errors (< 1.5 mm). Positioning according skin marks results in higher inaccuracies of ±1.5 – 2 mm in RL and ±2 – 2.5 mm in AP/SI direction.</p> <p>Conclusions</p> <p>In case of appropriate patient instructions (constant organ filling) the positioning via bone fusion requires CTV-PTV margins of 2 mm in RL, 4 mm in AP, and 5 mm in SI direction. Studies without any description of patient instruction found much higher margins of > 1 cm in AP and SI direction.</p> |
| first_indexed | 2024-04-14T01:01:28Z |
| format | Article |
| id | doaj.art-602798cbe18f47dd96d283cee0c40b6a |
| institution | Directory Open Access Journal |
| issn | 1748-717X |
| language | English |
| last_indexed | 2024-04-14T01:01:28Z |
| publishDate | 2012-08-01 |
| publisher | BMC |
| record_format | Article |
| series | Radiation Oncology |
| spelling | doaj.art-602798cbe18f47dd96d283cee0c40b6a2022-12-22T02:21:23ZengBMCRadiation Oncology1748-717X2012-08-017112510.1186/1748-717X-7-125Appropriate patient instructions can reduce prostate motionGraf ReinholdBoehmer DirkNadobny JacekBudach VolkerWust Peter<p>Abstract</p> <p>Background</p> <p>Interfraction prostate motion must be compensated by increased safety margins. If filling status of rectum and bladder is constant, motion should be reduced. We attempted to reduce interfraction motion errors by proper patient instruction.</p> <p>Method</p> <p>In 38 patients pairs of radio-opaque fiducial markers were implanted prior to definitive radiotherapy. Patients were positioned either according to skin marks or infrared body marker. We measured prostate displacement, i.e. pelvic bones versus intraprostatic marker position, via ExacTrac (two orthogonal radiographies) in 1252 fractions. Systematic and random setup and displacement errors were determined and safety margins estimated.</p> <p>Results</p> <p>In our study interfraction prostate displacement is < 1 mm in RL direction, and < 2 mm in AP and SI direction. Systematic errors are slightly below random errors (< 1.5 mm). Positioning according skin marks results in higher inaccuracies of ±1.5 – 2 mm in RL and ±2 – 2.5 mm in AP/SI direction.</p> <p>Conclusions</p> <p>In case of appropriate patient instructions (constant organ filling) the positioning via bone fusion requires CTV-PTV margins of 2 mm in RL, 4 mm in AP, and 5 mm in SI direction. Studies without any description of patient instruction found much higher margins of > 1 cm in AP and SI direction.</p>http://www.ro-journal.com/content/7/1/125Patient instructionFiducial markersProstate motion |
| spellingShingle | Graf Reinhold Boehmer Dirk Nadobny Jacek Budach Volker Wust Peter Appropriate patient instructions can reduce prostate motion Radiation Oncology Patient instruction Fiducial markers Prostate motion |
| title | Appropriate patient instructions can reduce prostate motion |
| title_full | Appropriate patient instructions can reduce prostate motion |
| title_fullStr | Appropriate patient instructions can reduce prostate motion |
| title_full_unstemmed | Appropriate patient instructions can reduce prostate motion |
| title_short | Appropriate patient instructions can reduce prostate motion |
| title_sort | appropriate patient instructions can reduce prostate motion |
| topic | Patient instruction Fiducial markers Prostate motion |
| url | http://www.ro-journal.com/content/7/1/125 |
| work_keys_str_mv | AT grafreinhold appropriatepatientinstructionscanreduceprostatemotion AT boehmerdirk appropriatepatientinstructionscanreduceprostatemotion AT nadobnyjacek appropriatepatientinstructionscanreduceprostatemotion AT budachvolker appropriatepatientinstructionscanreduceprostatemotion AT wustpeter appropriatepatientinstructionscanreduceprostatemotion |