Feasibility Study of Radiation Dose Reduction in Adult Female Pelvic CT Scan with Low Tube-Voltage and Adaptive Statistical Iterative Reconstruction

Objective To evaluate image quality of female pelvic computed tomography (CT) scans reconstructed with the adaptive statistical iterative reconstruction (ASIR) technique combined with low tube-voltage and to explore the feasibility of its clinical application. Materials and Methods Ninety-four patients were divided into two groups. The study group used 100 kVp, and images were reconstructed with 30%, 50%, 70%, and 90% ASIR. The control group used 120 kVp, and images were reconstructed with 30% ASIR. The noise index was 15 for the study group and 11 for the control group. The CT values and noise levels of different tissues were measured. The contrast to noise ratio (CNR) was calculated. A subjective evaluation was carried out by two experienced radiologists. The CT dose index volume (CTDIvol) was recorded. Results A 44.7% reduction in CTDIvol was observed in the study group (8.18 ± 3.58 mGy) compared with that in the control group (14.78 ± 6.15 mGy). No significant differences were observed in the tissue noise levels and CNR values between the 70% ASIR group and the control group (p = 0.068-1.000). The subjective scores indicated that visibility of small structures, diagnostic confidence, and the overall image quality score in the 70% ASIR group was the best, and were similar to those in the control group (1.87 vs. 1.79, 1.26 vs. 1.28, and 4.53 vs. 4.57; p = 0.122-0.585). No significant difference in diagnostic accuracy was detected between the study group and the control group (42/47 vs. 43/47, p = 1.000). Conclusion Low tube-voltage combined with automatic tube current modulation and 70% ASIR allowed the low CT radiation dose to be reduced by 44.7% without losing image quality on female pelvic scan.

[1]  Yong Eun Chung,et al.  Radiation Dose Reduction via Sinogram Affirmed Iterative Reconstruction and Automatic Tube Voltage Modulation (CARE kV) in Abdominal CT , 2013, Korean journal of radiology.

[2]  Natalie N. Braun,et al.  Strategies for reducing radiation dose in CT. , 2009, Radiologic clinics of North America.

[3]  Standard dose versus low-dose abdominal and pelvic CT: comparison between filtered back projection versus adaptive iterative dose reduction 3D. , 2014, Diagnostic and interventional imaging.

[4]  Ling Wang,et al.  Effect of Low Tube Voltage on Image Quality, Radiation Dose, and Low-Contrast Detectability at Abdominal Multidetector CT: Phantom Study , 2012, Journal of biomedicine & biotechnology.

[5]  Jiang Hsieh,et al.  Adaptive statistical iterative reconstruction technique for radiation dose reduction in chest CT: a pilot study. , 2011, Radiology.

[6]  B. Choi,et al.  Low tube voltage intermediate tube current liver MDCT: sinogram-affirmed iterative reconstruction algorithm for detection of hypervascular hepatocellular carcinoma. , 2013, AJR. American journal of roentgenology.

[7]  D. Sahani,et al.  Reducing Abdominal CT Radiation Dose With Adaptive Statistical Iterative Reconstruction Technique , 2010, Investigative radiology.

[8]  Thomas L Toth,et al.  Dose reduction and compliance with pediatric CT protocols adapted to patient size, clinical indication, and number of prior studies. , 2009, Radiology.

[9]  M. Kalra,et al.  Strategies for CT radiation dose optimization. , 2004, Radiology.

[10]  E. Samei,et al.  Low-tube-voltage, high-tube-current multidetector abdominal CT: improved image quality and decreased radiation dose with adaptive statistical iterative reconstruction algorithm--initial clinical experience. , 2010, Radiology.

[11]  Varut Vardhanabhuti,et al.  Image Comparative Assessment Using Iterative Reconstructions: Clinical Comparison of Low-Dose Abdominal/Pelvic Computed Tomography Between Adaptive Statistical, Model-Based Iterative Reconstructions and Traditional Filtered Back Projection in 65 Patients , 2014, Investigative radiology.

[12]  Jean-Baptiste Thibault,et al.  A three-dimensional statistical approach to improved image quality for multislice helical CT. , 2007, Medical physics.

[13]  Ke-min Chen,et al.  CT of the pancreas: comparison of image quality and pancreatic duct depiction among model-based iterative, adaptive statistical iterative, and filtered back projection reconstruction techniques , 2014, Abdominal Imaging.

[14]  William Pavlicek,et al.  Abdominal CT: comparison of low-dose CT with adaptive statistical iterative reconstruction and routine-dose CT with filtered back projection in 53 patients. , 2010, AJR. American journal of roentgenology.

[15]  Myeong-Jin Kim,et al.  Body size indexes for optimizing iodine dose for aortic and hepatic enhancement at multidetector CT: comparison of total body weight, lean body weight, and blood volume. , 2010, Radiology.

[16]  J. Platt,et al.  CT enterography at 80 kVp with adaptive statistical iterative reconstruction versus at 120 kVp with standard reconstruction: image quality, diagnostic adequacy, and dose reduction. , 2012, AJR. American journal of roentgenology.

[17]  David H. Kim,et al.  Abdominal CT with model-based iterative reconstruction (MBIR): initial results of a prospective trial comparing ultralow-dose with standard-dose imaging. , 2012, AJR. American journal of roentgenology.

[18]  Jingyan Xu,et al.  Is iterative reconstruction ready for MDCT? , 2009, Journal of the American College of Radiology : JACR.

[19]  Alvin C. Silva,et al.  Innovations in CT dose reduction strategy: application of the adaptive statistical iterative reconstruction algorithm. , 2010, AJR. American journal of roentgenology.

[20]  James H Thrall,et al.  Clinical comparison of standard-dose and 50% reduced-dose abdominal CT: effect on image quality. , 2002, AJR. American journal of roentgenology.

[21]  Anne Catrine Trægde Martinsen,et al.  Iterative reconstruction reduces abdominal CT dose. , 2012, European journal of radiology.

[22]  Jiang Hsieh,et al.  Abdominal CT: comparison of adaptive statistical iterative and filtered back projection reconstruction techniques. , 2010, Radiology.

[23]  R. Raupach,et al.  Iterative reconstruction algorithm for abdominal multidetector CT at different tube voltages: assessment of diagnostic accuracy, image quality, and radiation dose in a phantom study. , 2011, Radiology.

[24]  Wen He,et al.  Combining Automatic Tube Current Modulation with Adaptive Statistical Iterative Reconstruction for Low-Dose Chest CT Screening , 2014, PloS one.

[25]  Alvin C. Silva,et al.  Iterative Reconstruction Technique for Reducing Body Radiation Dose at Ct: Feasibility Study Hara Et Al. Ct Iterative Reconstruction Technique Gastrointestinal Imaging Original Research , 2022 .

[26]  Alvin C. Silva,et al.  Reducing the radiation dose for CT colonography using adaptive statistical iterative reconstruction: A pilot study. , 2010, AJR. American journal of roentgenology.

[27]  M. Kalra,et al.  Radiation Dose Reduction With Chest Computed Tomography Using Adaptive Statistical Iterative Reconstruction Technique: Initial Experience , 2010, Journal of computer assisted tomography.