Total Bolus Extraction Method Improves Arterial Image Quality in Dynamic CTAs Derived from Whole-Brain CTP Data

Background and Purposes. The 320-detector row CT scanner enables visualization of whole-brain hemodynamic information (dynamic CT angiography (CTA) derived from CT perfusion scans). However, arterial image quality in dynamic CTA (dCTA) is inferior to arterial image quality in standard CTA. This study evaluates whether the arterial image quality can be improved by using a total bolus extraction (ToBE) method.Materials and Methods. DCTAs of 15 patients, who presented with signs of acute cerebral ischemia, were derived from 320-slice CT perfusion scans using both the standard subtraction method and the proposed ToBE method. Two neurointerventionalists blinded to the scan type scored the arterial image quality on a 5-point scale in the 4D dCTAs in consensus. Arteries were divided into four categories: (I) large extradural, (II) intradural (large, medium, and small), (III) communicating arteries, and (IV) cerebellar and ophthalmic arteries.Results. Quality of extradural and intradural arteries was significantly higher in the ToBE dCTAs than in the standard dCTAs (extraduralP=0.001, large intraduralP<0.001, medium intraduralP<0.001, and small intraduralP<0.001).Conclusion. The 4D dCTAs derived with the total bolus extraction (ToBE) method provide hemodynamic information combined with improved arterial image quality as compared to standard 4D dCTAs.

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THE IMPACT OF HEAD POSITIONING ON THE IMAGE QUALITY OF MULTI-DETECTOR COMPUTED TOMOGRAPHY

Biomedical Engineering Applications Basis and Communications ◽

10.4015/s1016237221500502 ◽

2021 ◽

pp. 2150050

Author(s):

Yang-Ting Hsu ◽

Jo-Chi Jao

Keyword(s):

Computed Tomography ◽

Image Quality ◽

Control Group ◽

Ct Scanner ◽

Head Ct ◽

Radiologic Technologists ◽

Head Positioning ◽

The Impact ◽

Multi Detector Computed Tomography

Radiologic technologists face various types of patients during multi-detector computed tomography (CT) examinations. In emergency departments, it is common to have patients who cannot follow instructions for the examinations. The asymmetric axial view of the head CT might affect the correctness of the clinician’s diagnosis. This study aimed to assess the impact of head positioning on the image quality of head CT using two phantoms. All scans were performed on a 16-slice CT scanner. In the control group, the tilted angle of the phantoms was 0[Formula: see text], and no multiplanar reconstruction (MPR) was performed. In the experimental groups, the tilted angles of the phantoms were 5[Formula: see text], 10[Formula: see text] and 15[Formula: see text], respectively, and MPR was performed afterwards. The results showed that if the head was tilted during the head CT examinations, image asymmetry and artifacts appeared without MPR. After MPR, one phantom showed that there were significant differences and the other phantom showed no significant differences quantitatively in image symmetry and artifacts between experimental groups and the control group, while both phantoms showed no significant differences qualitatively in image symmetry and artifacts between experimental groups and the control group. Although MPR can correct the image asymmetry and artifacts caused by tilted head positioning to some extent, it consumes time. Therefore, technologists should position the head as exactly as possible when performing head CT examinations.

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The value of whole-brain CT perfusion imaging and CT angiography using a 320-slice CT scanner in the diagnosis of MCI and AD patients

European Radiology ◽

10.1007/s00330-017-4865-1 ◽

2017 ◽

Vol 27 (11) ◽

pp. 4756-4766 ◽

Cited By ~ 7

Author(s):

Bo Zhang ◽

Guo-jun Gu ◽

Hong Jiang ◽

Yi Guo ◽

Xing Shen ◽

...

Keyword(s):

Ct Angiography ◽

Perfusion Imaging ◽

Ct Perfusion ◽

Ct Scanner ◽

Whole Brain ◽

Brain Ct ◽

Ct Perfusion Imaging

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Comparison of image quality of atrial fibrillation and normal sinus rhythm ratients on single beat volumetric CT scanner, initial experience with a new CT scanner

Journal of Cardiovascular Computed Tomography ◽

10.1016/j.jcct.2015.12.036 ◽

2016 ◽

Vol 10 (2) ◽

pp. e13

Author(s):

Muhammad A. Latif ◽

Abner D. Wilding ◽

Kadeem Walker ◽

Emir Veledar ◽

Juan C. Batlle ◽

...

Keyword(s):

Atrial Fibrillation ◽

Image Quality ◽

Sinus Rhythm ◽

Normal Sinus Rhythm ◽

Initial Experience ◽

Ct Scanner ◽

Normal Sinus ◽

Volumetric Ct

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Size dependence of inherent image quality of a 2nd generation dual source CT scanner

International Journal of Diagnostic Imaging ◽

10.5430/ijdi.v3n1p40 ◽

2015 ◽

Vol 3 (1) ◽

Author(s):

Yakun Zhang ◽

Justin Solomon ◽

Ehsan Samei

Keyword(s):

Image Quality ◽

Size Dependence ◽

Dual Source Ct ◽

Ct Scanner ◽

2Nd Generation ◽

Dual Source

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Radiation doses and image quality of abdominal CT scans at different patient sizes using spectral detector CT scanner: a phantom and clinical study

Abdominal Radiology ◽

10.1007/s00261-019-02247-1 ◽

2019 ◽

Vol 45 (10) ◽

pp. 3361-3368 ◽

Cited By ~ 3

Author(s):

Xinhui Duan ◽

Lakshmi Ananthakrishnan ◽

Jeffrey B. Guild ◽

Yin Xi ◽

Prabhakar Rajiah

Keyword(s):

Clinical Study ◽

Image Quality ◽

Ct Scans ◽

Radiation Doses ◽

Ct Scanner ◽

Abdominal Ct ◽

Spectral Detector Ct

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Whole brain CT perfusion on a 320-slice CT scanner

Indian Journal of Radiology and Imaging ◽

10.4103/0971-3026.85370 ◽

2011 ◽

Vol 21 (3) ◽

pp. 209 ◽

Cited By ~ 14

Author(s):

JaiJai Shiva Shankar ◽

Cheemun Lum

Keyword(s):

Ct Perfusion ◽

Ct Scanner ◽

Whole Brain ◽

Brain Ct

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Image quality, radiation dose and diagnostic accuracy of 70 kVp whole brain volumetric CT perfusion imaging: a preliminary study

European Radiology ◽

10.1007/s00330-016-4225-6 ◽

2016 ◽

Vol 26 (11) ◽

pp. 4184-4193 ◽

Cited By ~ 9

Author(s):

Xiao Kun Fang ◽

Qian Qian Ni ◽

U. Joseph Schoepf ◽

Chang Sheng Zhou ◽

Guo Zhong Chen ◽

...

Keyword(s):

Image Quality ◽

Radiation Dose ◽

Diagnostic Accuracy ◽

Perfusion Imaging ◽

Ct Perfusion ◽

Whole Brain ◽

Ct Perfusion Imaging ◽

Preliminary Study ◽

Volumetric Ct

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The Impact of Varying Number of OSEM Iterations on Standardized Uptake Value and Image Quality of Discovery STE PET/CT Scanner

Journal of Global Oncology ◽

10.1200/jgo.18.33600 ◽

2018 ◽

Vol 4 (Supplement 2) ◽

pp. 68s-68s

Author(s):

B. Ali ◽

A. Afshan ◽

M.B. Kakakhel

Keyword(s):

Image Quality ◽

Standardized Uptake Value ◽

Acquisition Time ◽

List Mode ◽

Ct Scanner ◽

Matrix Size ◽

Cold Lesion ◽

Pet Ct ◽

The Impact

Background: In PET imaging both quantitative and qualitative interpretations are used. Qualitative and quantitative interpretations depend upon PET/CT image quality that along with many biologic factors strongly depends upon image reconstruction parameters. Aim: The objective of this experimental work was to study the impact of one of the key reconstruction parameter, i.e., number of reconstruction iteration, on standardized uptake value and image quality of PET/CT scan. Methods: Images of NEMA IEC Image Quality Phantom were acquired in list mode for 10 mins on Discovery STE PET/CT scanner, using tumor to background ratio of 4:1 and 18F-FDG as radiotracer. List mode data were further transformed into data sets of varying acquisition time (0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0 mins) per bed position. Transformed data set of 5.0 mins were used to study the impact of varying number of iterations (2, 3, 4, 5, 7, 10, 15, 20) using OSEM approach of iterative reconstruction. Standardized uptake value (SUV) and underestimation in SUV were calculated as quantitative measures, while hot lesion contrast, cold lesion contrast and background variability were calculated as qualitative measures. Results: Standardized uptake value, hot and cold lesion contrast, image spatial resolution and background variability showed increasing trend with increase in reconstruction iterations. Maximum increase of 20.25%, 16.33%, 9.79% and 6.88% was observed in SUV for 10 mm, 13 mm, 17 mm and 22 mm lesions as number of iteration change from 2 to 3. Smallest and the largest diameter lesions showed maximum underestimations of 54.67% and 8.20% at 2 iterations respectively. Percentage hot lesion contrast showed rapid increase as the number of iteration change from 2 to 7 and increased slowly afterward. Background variability range from 4.4% to 6.4%, 4.1%–5.7%, 3.6%–4.6%, 3%–3.8%, 2.7%–3.2%, 2.4%–2.7% for 10.0 mm, 13.0 mm, 17.0 mm, 22.0 mm, 28.0 mm and 37.0 mm sphere respectively. Conclusion: Optimized reconstruction parameters for routine clinical studies 3 iterations with image matrix size of 128 × 128 with filters FWHM of 6 mm and for high resolution studies 3 iterations image matrix size of 256×256 with filters FWHM of 6 mm.

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