Impact of Knowledge-Based Iterative Model Reconstruction in Abdominal Dynamic CT With Low Tube Voltage and Low Contrast Dose

• DOI: 10.2214/ajr.15.14518
• Publication Date: 2016-03-14T17:27:19Z
• Authors: Yuji Iyama; Takeshi Nakaura; Koichi Yokoyama; Masafumi Kidoh; Kazunori Harada; Shinichi Tokuyasu; Yasuyuki Yamashita
• Keywords: Male; Radiography, Abdominal; Liver Neoplasms; Contrast Media; Middle Aged; Radiation Dosage; 03 medical and health sciences; 0302 clinical medicine; Humans; Radiographic Image Interpretation, Computer-Assisted; Female; Prospective Studies; Tomography, X-Ray Computed; Aged

The purpose of this study was to compare iterative model reconstruction (IMR) and hybrid (HIR) 80-kVp abdominal dynamic CT scans obtained with a low-dose contrast agent.A group 27 consecutively registered patients underwent an protocol low dose agent (300 mg I/kg). Another who had previously undergone 120-kVp filtered back projection (FBP) standard (600 I/kg) acted as control subjects. Effective dose, image noise, number, contrast-to-noise ratio were compared between the images FBP, HIR, IMR. Image contrast, sharpness, noise texture, overall quality evaluated for four protocols.The effective lower than that protocol. HIR IMR decreased by 45% 70% FBP. higher Qualitatively, improved more did, but texture worse. yielded similar subjective quality.Use allowed approximately 50% reduction in 40% radiation use while preserving quality. reduced worsened texture.