As new innovative and increasingly sophisticated image processing techniques are continually reported in the medical imaging literature, concurrent sophistication in methods for critical evaluation and quality control is lacking. Despite numerous reports of novel DIR algorithms and their potential diagnostic and therapeutic medical applications, the scientific literature is lacking standardized procedures for DIR performance evaluation, comparison testing, and validation specific to medical application. Expert-determined anatomic feature-pairs have the potential to become a widely adopted reference for evaluating DIR spatial accuracy; however, there is still great variability in their use. Statistical methods for analyzing the matched landmark pairs have been limited to descriptive statistics summarizing the measured registration errors, failing to account for uncertainty in anatomic localization, variability among observers, and voxel discretization of the image space. The utility of Bayesian methods in the interpretation of modern medical research data has long been recognized. For our purposes, the strength of a Bayesian approach is one that allows judgment regarding an algorithm's performance characteristics to be derived from multiple sources, including multiple observers for feature-pair localization, multiple imaging modalities, and independent reference datasets. This facilitates interpretation of the measured data, and allows us to incorporate knowledge of the imaging acquisition and reconstruction process into formulation of prior distributions reflective of the underlying physical processes. This results in a more complete representation of an algorithm's spatial accuracy performance than is available today. The goal of the proposed research is to develop a computational framework and software infrastructure for Bayesian analysis of deformable image registration spatial accuracy. Software for performing these analyses will be incorporated into a publicly available reference image database, allowing investigators to quantitatively evaluate and compare multiple image registration algorithms/implementations on a common dataset, within a standard analysis framework that is currently lacking.
The Specific Aims of the proposed research are: 1. Create a reference library of cases to measure DIR spatial accuracy performance and uncertainty for inter-modality (CT-MRI) registration. 2. Develop and validate a Bayesian hierarchical model for DIR spatial accuracy evaluation using the expert selected landmark feature approach. 3. Disseminate software for standardized Bayesian analysis of DIR spatial accuracy. The availability of a common dataset for DIR evaluation that is broadly applicable will facilitate streamlined comparative evaluation and meta-analysis of the scientific literature, and provide a foundation upon which to develop a standardized evaluation methodology that is presently lacking. Additionally, there is much interest to adopt a multi-modality approach to pre-treatment radiotherapy (RT) planning and image guided RT delivery, in which the superior acquisition and soft-tissue characteristics of magnetic resonance imaging (MRI) are integrated with the electron density information and geometric fidelity inherent to computed tomography (CT). Inclusion of CT-MRI reference data will allow investigators to explore feasibility of a multi-modal approach to RT planning and image-guided delivery, which requires accurate spatial registration of the complementary datasets. By providing a rigorous computational framework for incorporating uncertainty in the use of anatomic feature-pairs for DIR evaluation, the proposed study has the potential to shape future protocol guidelines for clinical validation, acceptance testing, and quality assurance of DIR in medical imaging.
Advanced image processing technologies are continually reported in the medical imaging literature, with many potential applications in radiation oncology and diagnostic imaging. However, before these applications can be safely translated into clinical use, a consistent framework for critical evaluation and quality control must be established. We propose to develop a formalism based on sophisticated computational methods to facilitate this task in the radiotherapy setting, thereby permitting innovations in image processing research to advance the standard of care in radiotherapy planning and delivery. The written critiques of individual reviewers are provided in essentially unedited form in this section. Please note that these critiques and criteria scores were prepared prior to the meeting and may not have been revised subsequent to any discussions at the review meeting. The Resume and Summary of Discussion section above summarizes the final opinions of the committee.
|Vinogradskiy, Yevgeniy; Schubert, Leah; Diot, Quentin et al. (2016) Regional Lung Function Profiles of Stage I and III Lung Cancer Patients: An Evaluation for Functional Avoidance Radiation Therapy. Int J Radiat Oncol Biol Phys 95:1273-80|
|Patel, Sagar C; Paulino, Arnold C; Johnston, Danielle et al. (2016) Gemcitabine-induced radiation recall myositis in a patient with relapsed nasopharyngeal carcinoma. Pract Radiat Oncol :|
|Fuentes, D; Contreras, J; Yu, J et al. (2015) Morphometry-based measurements of the structural response to whole-brain radiation. Int J Comput Assist Radiol Surg 10:393-401|
|Mohamed, Abdallah S R; Ruangskul, Manee-Naad; Awan, Musaddiq J et al. (2015) Quality assurance assessment of diagnostic and radiation therapy-simulation CT image registration for head and neck radiation therapy: anatomic region of interest-based comparison of rigid and deformable algorithms. Radiology 274:752-63|
|Castillo, Richard; Pham, Ngoc; Castillo, Edward et al. (2015) Pre-Radiation Therapy Fluorine 18 Fluorodeoxyglucose PET Helps Identify Patients with Esophageal Cancer at High Risk for Radiation Pneumonitis. Radiology 275:822-31|
|Brennan, Douglas; Schubert, Leah; Diot, Quentin et al. (2015) Clinical validation of 4-dimensional computed tomography ventilation with pulmonary function test data. Int J Radiat Oncol Biol Phys 92:423-9|
|Castillo, Sarah J; Castillo, Richard; Castillo, Edward et al. (2015) Evaluation of 4D CT acquisition methods designed to reduce artifacts. J Appl Clin Med Phys 16:4949|
|Cunliffe, Alexandra; Armato 3rd, Samuel G; Castillo, Richard et al. (2015) Lung texture in serial thoracic computed tomography scans: correlation of radiomics-based features with radiation therapy dose and radiation pneumonitis development. Int J Radiat Oncol Biol Phys 91:1048-56|
|Castillo, Sarah J; Castillo, Richard; Balter, Peter et al. (2014) Assessment of a quantitative metric for 4D CT artifact evaluation by observer consensus. J Appl Clin Med Phys 15:4718|
|Liu, Suyu; Yuan, Ying; Castillo, Richard et al. (2014) Evaluation of image registration spatial accuracy using a Bayesian hierarchical model. Biometrics 70:366-77|
Showing the most recent 10 out of 13 publications