Head CT: Image quality improvement of posterior fossa and radiation dose reduction with ASiR - comparative studies of CT head examinations

Guziński, Maciej; Waszczuk, Łukasz; Sąsiadek, Marek

doi:10.1007/s00330-015-4183-4

Cited by 20 publications

(12 citation statements)

References 20 publications

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“…However, its use in the posterior fossa for clinical-decision making has not been as widely accepted. This is mostly due to physiological factors, such as the beam hardening artefact created by bony interference of the cranial vault, and technical factors such as limited zaxis coverage and high variability between automated perfusion software and CT vendor software (8)(9)(10).…”

Section: Introductionmentioning

confidence: 99%

Multimodal Computed Tomography Increases the Detection of Posterior Fossa Strokes Compared to Brain Non-contrast Computed Tomography

et al. 2020

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Aims: Multimodal computed tomography (mCT) (non-contrast CT, CT angiography, and CT perfusion) is not routinely used to assess posterior fossa strokes. We described the area under the curve (AUC) of brain NCCT, WB-CTP automated core-penumbra maps and comprehensive CTP analysis (automated core-penumbra maps and all perfusion maps) for posterior fossa strokes.Methods: We included consecutive patients with signs and symptoms of posterior fossa stroke who underwent acute mCT and follow up magnetic resonance diffusion weighted imaging (DWI). Multimodal CT images were reviewed blindly and independently by two stroke neurologists and area under the receiver operating characteristic curve (AUC) was used to compare imaging modalities.Results: From January 2014 to December 2019, 83 patients presented with symptoms suggestive of posterior fossa strokes and had complete imaging suitable for inclusion (49 posterior fossa strokes and 34 DWI negative patients). For posterior fossa strokes, comprehensive CTP analysis had an AUC of 0.68 vs. 0.62 for automated core-penumbra maps and 0.55 for NCCT. For cerebellar lesions >5 mL, the AUC was 0.87, 0.81, and 0.66, respectively.Conclusion: Comprehensive CTP analysis increases the detection of posterior fossa lesions compared to NCCT and should be implemented as part of the routine imaging assessment in posterior fossa strokes.

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Section: Introductionmentioning

confidence: 99%

Multimodal Computed Tomography Increases the Detection of Posterior Fossa Strokes Compared to Brain Non-contrast Computed Tomography

et al. 2020

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“…Based on data provided by the United Nations Scientific Committee on Effects of Atomic Radiation (UNSCEAR), it is estimated that nearly half a million patients benefit from CT examinations everyday [21]. This widespread CT utilization raised the potential radiation risks particularly in children, such as cancer risk, over-exposures, or unjustified use of imaging [7,[22][23][24][25][26][27][28][29][30][31]. This issue directed recent CT researches and innovations to radiation dose reduction methods with preservation of resulting image quality [5,8,9].…”

Section: Discussionmentioning

confidence: 99%

“…Similarly, many studies have shown that IR algorithms have the potential to reduce the radiation dose of cranial CT scans by 20-45% [1,9,29]. Similarly, in a study using 40% ASIR algorithm for head CT, the total DLP was decreased by 19% with better image quality [28]. Another study scanned pediatric phantoms using 40% ASIR-V with 10% reduction of mA in head CT examination protocol and declared nearly 30% reduction of CTDI vol [6].…”

Section: Qualitative Image Assessmentmentioning

confidence: 93%

Value of using adaptive statistical iterative reconstruction-V (ASIR-V) technology in pediatric head CT dose reduction

Sherif

Said

Elsayed

et al. 2020

Egypt J Radiol Nucl Med

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Background: With widespread use of pediatric head CT, it is critically important to protect patients from radiation hazards, using reduced dose CT techniques. In this regard, adaptive statistical iterative reconstruction-V (ASIR-V) algorithm can decrease image noise, generating CT images of reasonable diagnostic quality with less radiation. The objective of this study was radiation dose assessment, quantitative and qualitative evaluation of reduced dose pediatric head CT using ASIR-V 60% and 80% reconstruction. Results: Retrospective analysis was performed on two groups of pediatric head CT examinations, a reduced dose CT examination group with ASIR-V reconstruction (ASIR group) (n = 27) and a standard dose CT examination group without ASIR reconstruction (non-ASIR group) (n = 14). The average effective dose (ED) of ASIR group was significantly lower than that of the non-ASIR group (1.04 ± 0.1 mS vs 3.48 ± 0.45 mS; p = 0.001). Quantitative analysis revealed comparable results of signal to noise ratio (SNR) and contrast to noise ratio (CNR) of ASIR and non-ASIR groups (p > 0.05). Qualitative evaluation of resulting images by two readers revealed comparable results of both ASIR and non-ASIR groups (p > 0.05) with excellent inter-reader agreement (κ = 0.97). Both quantitative and qualitative assessment demonstrated better ASIR-V 80% than ASIR-V 60% reconstructed images. Conclusion: ASIR-V algorithm is a promising technology for effective dose reduction of pediatric head CT with preservation of diagnostic image quality.

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“…CT scanning of the abdomen in patients is often complicated with artifacts and it relatively increases noise due to the abdomen being a thick and complex organ. One disadvantage of CT Abdomen is that the resulting image has a high noise level (Guzinski et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Adaptive Statistical Iterative Reconstruction for Optimization Image Quality of Ct Scan Abdomen

Indrati

Biyono³

2020

Jurnal Riset Kesehatan

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Adaptive Statistical Iterative Reconstruction is software used to reduce noise. In several hospital uses the ASIR application with varying percentages between radiographers. The purpose of this study was to determine differences in noise and anatomical image information on variations in the percentage of ASIR and ASIR values that reveal optimal CT scan anatomic image information. This type of research is experimental, data are taken from 30 samples of reconstructive CT scan of the abdomen by giving four variations of ASIR (0%, 40%, 60%, and 80%). Noise measurement is done by placing the ROI size of 105.61 mm2 at three points, namely superior liver, inferior liver and middle of the aorta on the axial section. while the assessment of anatomical image information by observation of the results of variations in the value of ASIR by two radiologists. Data analysis uses the One way Anova test to determine differences in noise, Friedman test to determine differences in anatomical image information with a confidence level of 95%. The results showed that there were differences in the abdominal CT scan image noise on variations in the percentage of ASIR with p -alues 0.001. Noise decreased with increasing percentage ASIR. The highest noise value is 15.34 at ASIR 0% while the lowest noise is 8.57 at ASIR 80%. There are differences in anatomical image information on the variation of ASIR with p-values 0.001. The percentage ASIR of 40% is the optimal ASIR value for displaying CT images of abdominal with mean rank of 3.46.

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Head CT: Image quality improvement of posterior fossa and radiation dose reduction with ASiR - comparative studies of CT head examinations

Cited by 20 publications

References 20 publications

Multimodal Computed Tomography Increases the Detection of Posterior Fossa Strokes Compared to Brain Non-contrast Computed Tomography

Multimodal Computed Tomography Increases the Detection of Posterior Fossa Strokes Compared to Brain Non-contrast Computed Tomography

Value of using adaptive statistical iterative reconstruction-V (ASIR-V) technology in pediatric head CT dose reduction

Adaptive Statistical Iterative Reconstruction for Optimization Image Quality of Ct Scan Abdomen

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