A recent report from the Radiological Physics Center (RPC) revealed that 38% of institutions failed the head- and-neck IMRT phantom credentialing test at the first attempt. A wide variety of causes for failure were identified. The report provides evidence that IMRT implementation is non-trivial and prone to error, and that patient treatment may be compromised as a result. A truly practical 3D dosimetry system would address a root cause of these failures, by enabling comprehensive dosimetric verification during commissioning and routine QA. This proposal will further develop a clinically viable 3D dosimetry system and conduct the first comprehensive 3D investigations of the accuracy of dosimetry in IMRT delivery, in patient cohorts. Our prior research has demonstrated that a new PRESAGE/optical-CT system can perform accurate and high- resolution 3D dosimetry, and has critical advantages over alternative approaches. These include substantially greater accuracy, lower noise, elimination of major sources of artifacts (scatter and edge effects), and improved practicality (robustness to lab/clinical environment, stability, machineability etc). These advantages render the PRESAGE/Optical-CT system a viable 3D dosimetry system for the future. We propose a strong 3- party consortium to pursue two major aims;a continued technical and investigational aim, and a new clinical applications aim. The consortium combines outstanding expertise in 3D dosimetry (Duke) with credentialing experience (RPC), and materials expertise (Rider).
The aims balance investigating innovations to facilitate 3D dosimetry for the non-specialized clinic, while still addressing the urgent need for detailed clinical IMRT dosimetry studies using a more specialized system. We hypothesize novel optical-CT scanning systems, and novel radiochromic formulations will achieve substantial increase in speed and practicality without compromising accuracy. We also hypothesize that 3D dosimetry techniques will detect more clinical IMRT deliveries failing standard comparison metrics, than conventional 2D techniques. This proposal will conduct the first comprehensive 3D investigations of the accuracy of IMRT deliveries in cohorts of patients in key clinical sites (pelvic, head-and-neck, and thorax). Successful completion will elevate the state-of-the-art for verification of advanced radiation treatments, and may demonstrate the feasibility of a powerful and comprehensive new 3D credentialing technology with potential to elevate the standard of practice in clinical trials. There is an urgent need to improve the accuracy of advanced radiation therapy. We investigate a 3- dimensional dosimetry system that will address this need by facilitating dosimetric error detection. The first comprehensive investigations of the accuracy of dosimetry in patient treatments in 3D will be conducted.

National Institute of Health (NIH)
National Cancer Institute (NCI)
Research Project (R01)
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Radiation Therapeutics and Biology Study Section (RTB)
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Deye, James
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Duke University
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Adamson, Justus; Yang, Yun; Juang, Titania et al. (2014) On the feasibility of polyurethane based 3D dosimeters with optical CT for dosimetric verification of low energy photon brachytherapy seeds. Med Phys 41:071705
Vidovic, A K; Juang, T; Meltsner, S et al. (2014) An investigation of a PRESAGE® in vivo dosimeter for brachytherapy. Phys Med Biol 59:3893-905
Klawikowski, Slade J; Yang, James N; Adamovics, John et al. (2014) PRESAGE 3D dosimetry accurately measures Gamma Knife output factors. Phys Med Biol 59:N211-20
Juang, Titania; Grant, Ryan; Adamovics, John et al. (2014) On the feasibility of comprehensive high-resolution 3D remote dosimetry. Med Phys 41:071706
Juang, Titania; Das, Shiva; Adamovics, John et al. (2013) On the need for comprehensive validation of deformable image registration, investigated with a novel 3-dimensional deformable dosimeter. Int J Radiat Oncol Biol Phys 87:414-21
Rankine, Leith; Oldham, Mark (2013) On the feasibility of optical-CT imaging in media of different refractive index. Med Phys 40:051701
Rankine, L J; Newton, J; Bache, S T et al. (2013) Investigating end-to-end accuracy of image guided radiation treatment delivery using a micro-irradiator. Phys Med Biol 58:7791-801
Newton, Joseph; Oldham, Mark; Thomas, Andrew et al. (2011) Commissioning a small-field biological irradiator using point, 2D, and 3D dosimetry techniques. Med Phys 38:6754-62
Thomas, Andrew; Newton, Joseph; Oldham, Mark (2011) A method to correct for stray light in telecentric optical-CT imaging of radiochromic dosimeters. Phys Med Biol 56:4433-51
Newton, J R; Thomas, A; Appleby, A et al. (2011) Preliminary Investigation of the Dosimetric Properties of 'RadGel' J Phys 250:49-53

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