To compare the image quality of high resolution CT scan of temporal bone reconstructed using novel adaptive statistical iterative reconstruction-v technique with conventional filter back projection reconstruction technique

To compare the image quality of high resolution CT scan of temporal bone reconstruction using a novel adaptive iterative reconstruction-V (IR) technique with conventional filter back projection technique. The objective (mean image noise, contrast-to-noise ratio (CNR) for the temporal bone and the mean attenuation value of soft tissue) and subjective image parameters (image noise, image contrast, overall visibility of temporal bone/soft issue visibility of small structures and overall diagnostic confidence) were assessed. Eighteen patient underwent standard protocol of CT temporal bone at our institution. The same raw data were reconstructed using FBP and ASIR 20 %, ASIR 40 %, ASIR 60 %, ASIR 80 %.result shows that image measurements revealed significantly less noise in the soft tissue than bone attenuation value for the ASIR (p-value<0.05). Used Wilcoxon signed rank test. Filter back projection and ASIR Bone with various percentages but there no significant difference in two methods (p < 0.05). Comparing Filter back projection Soft Tissue and ASIR Soft Tissue, there is significant with in ASIR-Soft Tissue percentages various percentages and also it is better than FBP (p < 0.05). Note Data are indicated Median and IQR=Interquartile range (25th and 75th percentile). It is statistically significant difference of increasing percentage of ASIR percentage of soft tissue. This study concluded that ASIR shows superior reduction of noise and improved image quality (both objective and subjective analysis) compared with ASIR and FBP CT Temporal bone examination.