Hybrid iterative reconstruction technique for liver CT scans for image noise reduction and image quality improvement: evaluation of the optimal iterative reconstruction strengths

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• 作者：Ji Soo Song ; Jeong Min Lee ; Ji Young Sohn ; Jeong-Hee Yoon…
• 关键词：Hybrid iterative reconstruction ; CT ; Image quality ; Reconstruction algorithm
• 刊名：La radiologia medica
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：120
• 期：3
• 页码：259-267
• 全文大小：1,268 KB
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• 刊物主题：Imaging / Radiology; Diagnostic Radiology; Interventional Radiology; Neuroradiology; Ultrasound;
• 出版者：Springer Milan
• ISSN：1826-6983

文摘

Purpose This study sought to investigate the effect of the hybrid iterative reconstruction (IR) algorithm (iDose, Philips Healthcare) on the improvement of image quality of computed tomography (CT) scans of the liver and determine the appropriate level of IR strength for clinical use. Materials and methods A total of 75 patients (41 men and 34 women; mean age, 59.5?years) with a primary abdominal malignancy who underwent two-phase liver CT scans for the work-up of their liver metastases, were included in this study. The CT images during the portal phase were reconstructed using either filtered back projection (FBP) or the hybrid IR algorithm with six different levels of IR strengths. The signal-to-noise ratio of the liver (SNRliver) and the contrast-to-noise ratio of the portal vein to muscle (CNRpv to m) were measured. For qualitative analysis, image noise, visibility of small intrahepatic vascular structures, beam-hardening artefact, lesion conspicuity, and overall image quality were graded by two radiologists. Results Quantitative analysis demonstrated that image noise was significantly reduced along with the increasing level of iDose and that the values of SNRliver and CNRpv to m were significantly better with iDose than those of FBP images. Qualitative assessment also showed significantly better results with iDose compared with FBP (p? Conclusions The hybrid IR technique is able to reduce image noise and to provide better image quality than FBP, and an intermediate strength of iDose (level 4) provided the highest quality images.