Cone-beam breast computed tomography with a displaced flat panel detector array

Medical Physics
Giovanni MettivierSergio Lo Meo

Abstract

In cone-beam computed tomography (CBCT), and in particular in cone-beam breast computed tomography (CBBCT), an important issue is the reduction of the image artifacts produced by photon scatter and the reduction of patient dose. In this work, the authors propose to apply the detector displacement technique (also known as asymmetric detector or "extended view" geometry) to approach this goal. Potentially, this type of geometry, and the accompanying use of a beam collimator to mask the unirradiated half-object in each projection, permits some reduction of radiation dose with respect to conventional CBBCT and a sizeable reduction of the overall amount of scatter in the object, for a fixed contrast-to-noise ratio (CNR). The authors consider a scan configuration in which the projection data are acquired from an asymmetrically positioned detector that covers only one half of the scan field of view. Monte Carlo simulations and measurements, with their CBBCT laboratory scanner, were performed using PMMA phantoms of cylindrical (70-mm diameter) and hemiellipsoidal (140-mm diameter) shape simulating the average pendant breast, at 80 kVp. Image quality was evaluated in terms of contrast, noise, CNR, contrast-to-noise ratio per unit of dos...Continue Reading

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Citations

Jul 2, 2015·Medical Physics·Antonio SarnoPaolo Russo
Oct 12, 2016·Medical Engineering & Physics·Antonio SarnoPaolo Russo
Apr 12, 2017·Physics in Medicine and Biology·G MettivierP Russo
May 21, 2013·Physics in Medicine and Biology·Srinivasan VedanthamStephen P Baker
Apr 26, 2020·Journal of X-ray Science and Technology·Srinivasan VedanthamAndrew Karellas
May 10, 2020·Journal of Synchrotron Radiation·Giovanni MettivierPaolo Russo
Jul 17, 2021·Optics Express·Haijun YuRifeng Zhou
Jul 22, 2021·Physics in Medicine and Biology·Joaquim G SanctorumJoris J J Dirckx

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