2009
DOI: 10.1088/0031-9155/54/21/016
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Reduction in x-ray scatter and radiation dose for volume-of-interest (VOI) cone-beam breast CT—a phantom study

Abstract: With volume-of-interest (VOI) cone beam computed tomography (CBCT) imaging, one set of projection images are acquired with the VOI collimator at a regular or high exposure level and the second set of projection images are acquired without the collimator at a reduced exposure level. The high exposure VOI scan data inside the VOI and the low exposure full field scan data outside the VOI are then combined together to generate composite projection images for image reconstruction. To investigate and quantify scatte… Show more

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Cited by 29 publications
(38 citation statements)
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“…To normalize image quality to the radiation dose to the patient, the figure of merit (FOM), which is independent of dose and can be used as an indicator of improvement in image quality per radiation risk to the patient, for each protocol is calculated as follows (31)(32)(33): Table 2 shows the CBCTDIw, measured using the 0.6 cc Farmer-type ionization chamber in either the 16-cm or 32-cm diameter CTDI phantom according to the scanning protocols. The CBCTDIw is an imperative and objective indicator of the average radiation dose within the CTDI phantom.…”
Section: Assessment Of Image Qualitymentioning
confidence: 99%
“…To normalize image quality to the radiation dose to the patient, the figure of merit (FOM), which is independent of dose and can be used as an indicator of improvement in image quality per radiation risk to the patient, for each protocol is calculated as follows (31)(32)(33): Table 2 shows the CBCTDIw, measured using the 0.6 cc Farmer-type ionization chamber in either the 16-cm or 32-cm diameter CTDI phantom according to the scanning protocols. The CBCTDIw is an imperative and objective indicator of the average radiation dose within the CTDI phantom.…”
Section: Assessment Of Image Qualitymentioning
confidence: 99%
“…Due to the gaining popularity of dedicated breast CT over the past few years, various studies have investigated the effect of scatter radiation in breast imaging with cone beam CT systems [112], and various methods have been proposed to reduce as well as correct for signals arising from scatter radiation [1324]. The purpose of this particular study is to characterize the scatter-to-primary ratios (SPR) for cone beam breast CT for a range of (breast) densities in the typical 2D format [3, 24].…”
Section: Introductionmentioning
confidence: 99%
“…Contrast-to-noise ratio (CNR) increased by up to 15% in zonally filtered CBCT images compared to full-field images due to the reduced scatter signal from attenuated beam. Chen et al [2] and Lai et al [38] proposed to use a volume-of-interest (VOI) filter for breast CBCT. In this method, a filtering mask is inserted between the x-ray source and the breast during image acquisition and the mask has an opening to allow full x-ray exposure to be delivered to a preselected VOI and a lower exposure to the region outside the VOI.…”
Section: Collimator-based Methodsmentioning
confidence: 99%