Accurate setup of paraspinal patients using a noninvasive patient immobilization cradle and portal imaging Journal Article
| Authors: | Lovelock, D. M.; Hua, C.; Wang, P.; Hunt, M.; Fournier-Bidoz, N.; Yenice, K.; Toner, S.; Lutz, W.; Amols, H.; Bilsky, M.; Fuks, Z.; Yamada, Y. |
| Article Title: | Accurate setup of paraspinal patients using a noninvasive patient immobilization cradle and portal imaging |
| Abstract: | Because of the proximity of the spinal cord, effective radiotherapy of paraspinal tumors to high doses requires highly conformal dose distributions, accurate patient setup, setup verification, and patient immobilization. An immobilization cradle has been designed to facilitate the rapid setup and radiation treatment of patients with paraspinal disease. For all treatments, patients were set up to within 2.5 mm of the design using an amorphous silicon portal imager. Setup reproducibility of the target using the cradle and associated clinical procedures was assessed by measuring the setup error prior to any correction. From 350 anterior/posterior images, and 303 lateral images, the standard deviations, as determined by the imaging procedure, were 1.3 m, 1.6 m, and 2.1 in the ant/post, right/left, and superior/inferior directions. Immobilization was assessed by measuring patient shifts between localization images taken before and after treatment. From 67 ant/post image pairs and 49 lateral image pairs, the standard deviations were found to be less than 1 mm in all directions. Careful patient positioning and immobilization has enabled us to develop a successful clinical program of high dose, conformal radiotherapy of paraspinal disease using a conventional Linac equipped with dynamic multileaf collimation and an amorphous silicon portal imager. © 2005 American Association of Physicists in Medicine. |
| Keywords: | intensity modulated radiation therapy; radiation dose; sensitivity and specificity; reproducibility; accuracy; reproducibility of results; radiotherapy dosage; radiotherapy; tomography, x-ray computed; spinal cord; spinal neoplasms; imaging; silicon dioxide; radiography; radiometry; radiotherapy planning, computer-assisted; radiotherapy, conformal; equipment design; tumor; patient positioning; computer program; performance; immobilization; equipment; formicidae; equipment failure analysis; paraspinal; setup uncertainty |
| Journal Title: | Medical Physics |
| Volume: | 32 |
| Issue: | 8 |
| ISSN: | 0094-2405 |
| Publisher: | American Association of Physicists in Medicine |
| Date Published: | 2005-08-01 |
| Start Page: | 2606 |
| End Page: | 2614 |
| Language: | English |
| DOI: | 10.1118/1.1951042 |
| PUBMED: | 16193791 |
| PROVIDER: | scopus |
| DOI/URL: | |
| Notes: | --- - "Cited By (since 1996): 26" - "Export Date: 24 October 2012" - "CODEN: MPHYA" - "Source: Scopus" |
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