An immobilization system for claustrophobic patients in head-and-neck intensity-modulated radiation therapy

Kim, Siyong; Akpati, H; Li, Jonathan G.; Liu, Chihray R.; Amdur, Robert J.; Palta, Jatinder

doi:10.1016/j.ijrobp.2004.01.025

Cited by 29 publications

(20 citation statements)

References 22 publications

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“…In our clinic, BrainLab ExacTrac system ͑BrainLAB AG, Heimstetten, Germany͒ is routinely used to setup head and neck cancer patients. 14,15 An IR camera system alone has the ability to accurately setup a patient on the couch to within a millimeter. [14][15][16] For this study, eight IR markers ͓Fig.…”

Section: Methodsmentioning

confidence: 99%

“…14,15 An IR camera system alone has the ability to accurately setup a patient on the couch to within a millimeter. [14][15][16] For this study, eight IR markers ͓Fig. 1͑a͔͒ were placed on the solid water slabs and the backscattering solid water at the time of the computed tomography ͑CT͒ scan and used for positioning the solid water slabs on the FIG.…”

Section: Methodsmentioning

confidence: 99%

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Evaluation of surface and build‐up region dose for intensity‐modulated radiation therapy in head and neck cancer

et al. 2005

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Despite much development, there remains dosimetric uncertainty in the surface and build-up regions in intensity-modulated radiation therapy treatment plans for head and neck cancers. Experiments were performed to determine the dosimetric discrepancies in the surface and build-up region between the treatment planning system (TPS) prediction and experimental measurement using radiochromic film. A head and neck compression film phantom was constructed from two semicylindrical solid water slabs. Treatment plans were generated using two commercial TPSs (PINNACLE3 and CORVUS) for two cases, one with a shallow (approximately 0.5 cm depth) target and another with a deep (approximately 6 cm depth) target. The plans were evaluated for a 54 Gy prescribed dose. For each case, two pieces of radiochromic film were used for dose measurement. A small piece of film strip was placed on the surface and another was inserted within the phantom. Overall, both TPSs showed good agreement with the measurement. For the shallow target case, the dose differences were within +/- 300 cGy (5.6% with respect to the prescribed dose) for PINNACLE3 and +/- 240 cGy (4.4%) for CORVUS in 90% of the region of interest. For the deep target case, the dose differences were +/- 350 (6.5%) for PINNACLE3 and +/- 260 cGy (4.8%) for CORVUS in 90% of the region of interest. However, it was found that there were significant discrepancies from the surface to about 0.2 cm in depth for both the shallow and deep target cases. It was concluded that both TPSs overestimated the surface dose for both shallow and deep target cases. The amount of overestimation ranges from 400 to 1000 cGy (approximately 7.4% to 18.5% with respect to the prescribed dose, 5400 cGy).

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Evaluation of surface and build‐up region dose for intensity‐modulated radiation therapy in head and neck cancer

et al. 2005

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“…However, it has been observed that in routine clinical adult head CT scans or in CT acquisitions for planning of various therapeutic procedures, patients are not likely to have head movement exceeding 10° of rotation and 10 mm of translation . In addition, residual motion less than those values can still be introduced even if an immobilization device is used to prevent head motion . Therefore, the ME scheme without any markers may be applied for routine clinical patients and for the patients using an immobilization device.…”

Section: Discussionmentioning

confidence: 99%

“…1 In addition, residual motion less than those values can still be introduced even if an immobilization device is used to prevent head motion. 4 Therefore, the ME scheme without any markers may be applied for routine clinical patients and for the patients using an immobilization device. On the other hand, patients with suspected acute ischemic stroke may have large head motion during computed tomography perfusion (CTP).…”

Section: Discussionmentioning

confidence: 99%

Head motion correction based on filtered backprojection for x‐ray CT imaging

Jang

Kim

et al. 2017

Medical Physics

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We propose a framework for head motion correction in an axial CT scan, which consists of motion estimation and compensation steps. Two image-based ME algorithms for rigid motion tracking are developed according to the degree of head motion. The estimated motion information is then used for MC image reconstruction. Both motion estimation and compensation algorithms are based on computationally efficient filtered backprojection. Excellent performance of the proposed framework is illustrated by means of simulations using a numerical phantom and experiments using a physical phantom.

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“…Immobilization systems can be classified as invasive 3 and noninvasive. 5,12,13 Regarding target(s) treatment navigation, tattoos and/or BB (fiducial) markers on the skin are the most commonly adopted methods in IMRT as other external beam radiotherapy. However, because most targets are deep-seated-as opposed to epithelial-any alignment to dermal BBs or tattoos cannot guarantee the alignment accuracy of the beams toward the target(s).…”

Section: Introductionmentioning

confidence: 99%

Optimization and quality assurance of an image-guided radiation therapy system for intensity-modulated radiation therapy radiotherapy

2012

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An immobilization system for claustrophobic patients in head-and-neck intensity-modulated radiation therapy

Cited by 29 publications

References 22 publications

Evaluation of surface and build‐up region dose for intensity‐modulated radiation therapy in head and neck cancer

Evaluation of surface and build‐up region dose for intensity‐modulated radiation therapy in head and neck cancer

Head motion correction based on filtered backprojection for x‐ray CT imaging

Optimization and quality assurance of an image-guided radiation therapy system for intensity-modulated radiation therapy radiotherapy

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