Utilizing the Hotelling template as a tool for CT image reconstruction algorithm design

Adrian A. Sanchez; Emil Y. Sidky; Xiaochuan Pan

doi:10.1117/12.913675

22 February 2012 Utilizing the Hotelling template as a tool for CT image reconstruction algorithm design

Adrian A. Sanchez, Emil Y. Sidky, Xiaochuan Pan

Proceedings Volume 8318, Medical Imaging 2012: Image Perception, Observer Performance, and Technology Assessment; 83180V (2012) https://doi.org/10.1117/12.913675
Event: SPIE Medical Imaging, 2012, San Diego, California, United States

Abstract

Design of image reconstruction algorithms for CT can be significantly aided by useful metrics of image quality. Useful metrics, however, are difficult to develop due to the high-dimensionality of the CT imaging system, lack of spatial invariance in the imaging system, and a high degree of correlation among the image voxels. Although true task-based evaluation on realistic imaging tasks can be time-consuming, and a given task may be insensitive to the image reconstruction algorithm, task-based metrics can still prove useful in many contexts. For example, model observers that mimic performance of the imaging system on specific tasks can provide a low-dimensional measure of image quality while still accounting for many of the salient properties of the system and object being scanned. In this work, ideal observer performance is computed on a single detection task. The modeled signal for detection is taken to be very small - size on the order of a detector bin - and inspection of the accompanying Hotelling template is suggested. We hypothesize that improved detection on small signals may be sensitive to the reconstruction algorithm. Further, we hypothesize that structurally simple Hotelling templates may correlate with high human observer performance.

Citation Download Citation

Adrian A. Sanchez, Emil Y. Sidky, and Xiaochuan Pan "Utilizing the Hotelling template as a tool for CT image reconstruction algorithm design", Proc. SPIE 8318, Medical Imaging 2012: Image Perception, Observer Performance, and Technology Assessment, 83180V (22 February 2012); https://doi.org/10.1117/12.913675

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