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Cranial CT with Adaptive Statistical Iterative Reconstruction: Improved Image Quality with Concomitant Radiation Dose Reduction

RAPALINO, O ; KAMALIAN, Shervin ; KAMALIAN, Shahmir ; PAYABVASH, S ; SOUZA, L. C. S ; ZHANG, D ; MUKTA, J ; SAHANI, D. V ; LEV, M. H ; POMERANTZ, S. R

American journal of neuroradiology : AJNR, 2012-04, Vol.33 (4), p.609-615 [Periódico revisado por pares]

Oak Brook, IL: American Society of Neuroradiology

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Título:
Cranial CT with Adaptive Statistical Iterative Reconstruction: Improved Image Quality with Concomitant Radiation Dose Reduction
Autor: RAPALINO, O ; KAMALIAN, Shervin ; KAMALIAN, Shahmir ; PAYABVASH, S ; SOUZA, L. C. S ; ZHANG, D ; MUKTA, J ; SAHANI, D. V ; LEV, M. H ; POMERANTZ, S. R
Assuntos: Adult ; Aged ; Aged, 80 and over ; Algorithms ; Biological and medical sciences ; Brain ; Brain - diagnostic imaging ; Computed tomography ; Data Interpretation, Statistical ; Data processing ; Differentiation ; Female ; Head ; Humans ; Image Enhancement - methods ; Image Interpretation, Computer-Assisted - methods ; Image processing ; Investigative techniques, diagnostic techniques (general aspects) ; Male ; Medical sciences ; Middle Aged ; Miscellaneous. Technology ; Nervous system ; Neuroimaging ; Parenchyma ; Patient Safety ; Radiation ; Radiation Dosage ; Radiation Protection - methods ; Radiodiagnosis. Nmr imagery. Nmr spectrometry ; Radiometry ; Reproducibility of Results ; Sensitivity and Specificity ; Skull ; spatial discrimination ; Statistical analysis ; Statistics ; Tomography, X-Ray Computed - methods ; Tomography, X-Ray Computed - statistics & numerical data
É parte de: American journal of neuroradiology : AJNR, 2012-04, Vol.33 (4), p.609-615
Notas: ObjectType-Article-2
SourceType-Scholarly Journals-1
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Otto Rapalino and Shervin Kamalian contributed equally to this work.
Descrição: To safeguard patient health, there is great interest in CT radiation-dose reduction. The purpose of this study was to evaluate the impact of an iterative-reconstruction algorithm, ASIR, on image-quality measures in reduced-dose head CT scans for adult patients. Using a 64-section scanner, we analyzed 100 reduced-dose adult head CT scans at 6 predefined levels of ASIR blended with FBP reconstruction. These scans were compared with 50 CT scans previously obtained at a higher routine dose without ASIR reconstruction. SNR and CNR were computed from Hounsfield unit measurements of normal GM and WM of brain parenchyma. A blinded qualitative analysis was performed in 10 lower-dose CT datasets compared with higher-dose ones without ASIR. Phantom data analysis was also performed. Lower-dose scans without ASIR had significantly lower mean GM and WM SNR (P = .003) and similar GM-WM CNR values compared with higher routine-dose scans. However, at ASIR levels of 20%-40%, there was no statistically significant difference in SNR, and at ASIR levels of ≥60%, the SNR values of the reduced-dose scans were significantly higher (P < .01). CNR values were also significantly higher at ASIR levels of ≥40% (P < .01). Blinded qualitative review demonstrated significant improvements in perceived image noise, artifacts, and GM-WM differentiation at ASIR levels ≥60% (P < .01). These results demonstrate that the use of ASIR in adult head CT scans reduces image noise and increases low-contrast resolution, while allowing lower radiation doses without affecting spatial resolution.
Editor: Oak Brook, IL: American Society of Neuroradiology
Idioma: Inglês

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Cranial CT with Adaptive Statistical Iterative Reconstruction: Improved Image Quality with Concomitant Radiation Dose Reduction

RAPALINO, O ; KAMALIAN, Shervin ; KAMALIAN, Shahmir ; PAYABVASH, S ; SOUZA, L. C. S ; ZHANG, D ; MUKTA, J ; SAHANI, D. V ; LEV, M. H ; POMERANTZ, S. R

Oak Brook, IL: American Society of Neuroradiology

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