Scatter and veiling glare estimation based on sampled primary intensity

Zhou, Yifang; Mathur, Tarun; Molloi, Sabee

doi:10.1118/1.598744

Cited by 16 publications

(15 citation statements)

References 24 publications

(39 reference statements)

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“…The major cause of this non-linearity is the physical degradation factors that include X-ray scatter and veiling glare [35]. Currently, there are techniques available to correct for the X-ray scatter and veiling glare [43, 44]. These techniques can be used to address this major physical limitation.…”

Section: Discussionmentioning

confidence: 99%

Estimation of coronary artery hyperemic blood flow based on arterial lumen volume using angiographic images

Molloi

Chalyan

Lê

et al. 2011

Int J Cardiovasc Imaging

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The purpose of this study is to develop a method to estimate the hyperemic blood flow in a coronary artery using the sum of the distal lumen volumes in a swine animal model. The limitations of visually assessing coronary artery disease are well known. These limitations are particularly important in intermediate coronary lesions where it is difficult to determine whether a particular lesion is the cause of ischemia. Therefore, a functional measure of stenosis severity is needed using angiographic image data. Coronary arteriography was performed in 10 swine (Yorkshire, 25–35 kg) after power injection of contrast material into the left main coronary artery. A densitometry technique was used to quantify regional flow and lumen volume in vivo after inducing hyperemia. Additionally, 3 swine hearts were casted and imaged post-mortem using cone-beam CT to obtain the lumen volume and the arterial length of corresponding coronary arteries. Using densitometry, the results showed that the stem hyperemic flow (Q) and the associated crown lumen volume (V) were related by Q = 159.08 V3/4 (r = 0.98, SEE = 10.59 ml/min). The stem hyperemic flow and the associated crown length (L) using cone-beam CT were related by Q = 2.89 L (r = 0.99, SEE = 8.72 ml/min). These results indicate that measured arterial branch lengths or lumen volumes can potentially be used to predict the expected hyperemic flow in an arterial tree. This, in conjunction with measured hyperemic flow in the presence of a stenosis, could be used to predict fractional flow reserve based entirely on angiographic data.

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Section: Discussionmentioning

confidence: 99%

Estimation of coronary artery hyperemic blood flow based on arterial lumen volume using angiographic images

Molloi

Chalyan

Lê

et al. 2011

Int J Cardiovasc Imaging

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“…[9][10][11][12] Deconvolution of the images using a measured PSF has been shown to significantly increase contrast ratios. 13 However, the characteristics and impact of veiling glare on clinical CBCT imaging has not been extensively studied.…”

Section: Introductionmentioning

confidence: 99%

Impact of flat panel‐imager veiling glare on scatter‐estimation accuracy and image quality of a commercial on‐board cone‐beam CT imaging system

Lazos

Williamson

2012

Medical Physics

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“…[38][39][40][41][42][43] Among them, the beam stop method has been widely used to measure the scatter component at a given point while the slat or edge spread method allows the scatter component to be measured along a straight line ͑for scatter distribution͒. In this study, we used a method referred to as the beam aperture array method to indirectly estimate the scatter component at selected locations.…”

Section: Iid Measurement Of Primary Scatter Signals and Sprsmentioning

confidence: 99%

“…However, there are several factors that affect the selections of aperture array parameters hence the accuracy of scatter estimation; they are mainly based on the following considerations 43 :…”

Section: Iid Measurement Of Primary Scatter Signals and Sprsmentioning

confidence: 99%

Scatter rejection and low‐contrast performance of a slot‐scan digital chest radiography system with electronic aft‐collimation: A chest phantom study

et al. 2008

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Anti-scatter grids have been widely used to reject scatter and increase the perceptibility of lowcontrast object in chest radiography; however they also attenuate the primary x-rays, resulting in a substantial degradation of primary information. Compensation for this degradation requires the use of higher exposure technique hence higher dose to the patient. A more efficient approach to reject scatter is the slot-scan imaging technique which employs a narrow scanning x-ray fan beam in conjunction with a slit or slot shaped solid state detector or an area detector used with an aftcollimator. With this approach, scatter can be rejected effectively without the need to attenuate primary x-rays. This paper demonstrates an electronic aft-collimation method, referred to as the alternate line erasure and readout ͑ALER͒ technique, for implementing the slot-scan digital radiography with a modern flat-panel detector. With this technique, instead of first exposing the detector and then reading the image line by line, the image line on the leading edge of the scanning fan beam is reset to erase the scatter accumulated prior to the arrival of the fan beam x-rays, while the image line on the trailing edge of the scanning fan beam is read out to acquire the image signals following the fan-beam exposure. These reset and readout processes are alternated and repeated as the x-ray fan beam scans across the detector. An anthropomorphic chest phantom was imaged to evaluate the scatter rejection ability and the low-contrast performance for the ALER technique and compare them with those for the anti-scatter grid method in full-field chest imaging. With a projected beam width of 16 mm, the slot-scan/ALER technique resulted in an average reduction of the scatter-toprimary ratios by 81%, 84%, 82%, and 86% versus 65%, 73%, 74%, and 73% with the anti-scatter grid method in the lungs, mediastinum, retrocardium, and subdiaphragm, respectively. The average CNR for the slot-scan/ALER technique was found to improve by 135%, 133%, 176%, and 87% versus 15%, 15%, 38%, and −11% with the anti-scatter grid method in the mediastinum, retrocardium, subdiaphragm, and lungs, respectively. These results demonstrated that the slot-scan/ALER technique can be used to achieve equally effective scatter rejection but substantially higher lowcontrast performance than the anti-scatter grid method.

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Scatter and veiling glare estimation based on sampled primary intensity

Cited by 16 publications

References 24 publications

Estimation of coronary artery hyperemic blood flow based on arterial lumen volume using angiographic images

Estimation of coronary artery hyperemic blood flow based on arterial lumen volume using angiographic images

Impact of flat panel‐imager veiling glare on scatter‐estimation accuracy and image quality of a commercial on‐board cone‐beam CT imaging system

Scatter rejection and low‐contrast performance of a slot‐scan digital chest radiography system with electronic aft‐collimation: A chest phantom study

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