Reducing Radiation Dose in Adult Head CT using Iterative Reconstruction - A Clinical Study in 177 XXXX .

@entity1 @entity615 @entity64 @entity548
UNASSIGNED: Purpose: To assess how ASIR (adaptive statistical iterative reconstruction) contributes to dose reduction and affects image quality of non-contrast cranial computed tomography (cCT). Materials and Methods: Non-contrast emergency CT scans of the head acquired in 177 @entity1 were evaluated. The scans were acquired and processed using four different protocols: Group A (control): 120kV, @entity615 ( @entity615 ) n=71; group B1: 120kV, scan and reconstruction performed with 20% ASIR (blending of 20% ASIR and 80% @entity615 ), n=86; group B2: raw data from group B1 reconstructed using a blending of 40% ASIR and 60% @entity615 , n=74; group C1: 120kV, scan and reconstruction performed with 30% ASIR, n=20; group C2: raw data from group C1 reconstructed using a blending of 50% ASIR and 50% @entity615 , n=20. The effective dose was calculated. Image quality was assessed quantitatively and qualitatively. Results: Compared to group A, groups B1/2 and C1/2 showed a significantly reduced effective dose of 40.4% and 73.3% (p<0.0001), respectively. Group B1 and group C1/2 also showed significantly reduced quantitative and qualitative image quality parameters. In group B2, quantitative measures were comparable to group A, and qualitative scores were lower compared to group A but higher compared to group B1. Diagnostic confidence grading showed groups B1/2 to be adequate for everyday clinical practice. Group C2 was considered acceptable for follow-up imaging of severe acute events such as @entity548 or subacute @entity64 . Conclusion: Use of ASIR makes it possible to reduce radiation significantly while maintaining adequate image quality in non-contrast head CT, which may be particularly useful for younger @entity1 in an emergency setting and in follow-up. Key Points:       ASIR may reduce radiation significantly while maintaining adequate image quality      cCT protocol with 20% ASIR and 40%ASIR/60% @entity615 blending is adequate for everyday clinical use      cCT protocol with 30% ASIR and 50%ASIR/50% @entity615 blending is adequate for follow-up imaging Citation Format:       Kaul D, Kahn J, Huizing L etal. Reducing Radiation Dose in Adult Head CT using Iterative Reconstruction - A Clinical Study in 177 @entity1 . Fortschr R  ntgenstr 2016; 188: 155-162.
