Low dose, low noise, and high resolution volume of interest (VOI) imaging in C-arm flat-detector CT

Daniel Kolditz; Yiannis Kyriakou; Willi A. Kalender

doi:10.1117/12.844129

22 March 2010 Low dose, low noise, and high resolution volume of interest (VOI) imaging in C-arm flat-detector CT

Daniel Kolditz, Yiannis Kyriakou, Willi A. Kalender

Proceedings Volume 7622, Medical Imaging 2010: Physics of Medical Imaging; 762226 (2010) https://doi.org/10.1117/12.844129
Event: SPIE Medical Imaging, 2010, San Diego, California, United States

Abstract

The high flexibility of C-arm flat-detector computed tomography (FDCT) is used in a volume of interest (VOI) imaging method to handle the challenges of increasing spatial resolution, reducing noise and saving dose. A low-dose overview scan of the object and a high-dose scan of an arbitrary VOI are combined. The first scan is adequate for orientation to select the VOI and the second scan assures high image quality in the VOI. The combination is based on a forward projection of the reconstructed overview volume and the measured VOI data in the raw data domain. Differences in the projection values are matched before a standard Feldkamp-type reconstruction is performed. In simulations, spatial resolution, noise and contrast detectability were evaluated. Measurements of an anthropomorphic phantom were used to validate the proposed method for realistic application. In Monte Carlo dose simulations the dose reduction potential was investigated. By combination of the two scans an image is generated which covers the whole object and provides the actual VOI at high image quality. Spatial resolution was increased whereas noise was decreased from outside to inside the VOI, e.g. for the simulations from 0.8 lp/mm to 3.0 lp/mm and from 39 HU to 18 HU, respectively. Simultaneously, the cumulative dose for this two-scan procedure was significantly reduced in comparison to a conventional high dose scan, e.g. for the performed simulations and measurements by about 95 %. The proposed VOI approach offers significant benefits with respect to high-resolution and low-contrast imaging of a VOI at reduced dose.

Citation Download Citation

Daniel Kolditz, Yiannis Kyriakou, and Willi A. Kalender "Low dose, low noise, and high resolution volume of interest (VOI) imaging in C-arm flat-detector CT", Proc. SPIE 7622, Medical Imaging 2010: Physics of Medical Imaging, 762226 (22 March 2010); https://doi.org/10.1117/12.844129

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