Sub-millisievert CT colonography: effect of knowledge-based iterative reconstruction on the detection of colonic polyps

• Published in: European radiology Vol. 28; no. 12; pp. 5258 - 5266
• Main Authors: Kang, Hyo-Jin, Kim, Se Hyung, Shin, Cheong-Il, Joo, Ijin, Ryu, Hwaseong, Kim, Sang Gyun, Im, Jong Pil, Han, Joon Koo
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.12.2018; Springer Nature B.V
• Subjects: Adult; Aged; Algorithms; Clinical Competence; Colon; Colonic Polyps - diagnosis; Colonography, Computed Tomographic - methods; Colonoscopy; Computed tomography; Diagnostic Radiology; Feasibility studies; Female; Gastrointestinal; Health care; Humans; Image filters; Image quality; Image reconstruction; Imaging; Internal Medicine; Interventional Radiology; Iterative methods; Knowledge base; Male; Medical imaging; Medicine; Medicine & Public Health; Middle Aged; Neuroradiology; Noise; Noise reduction; Polyps; Quality assessment; Radiation; Radiation Dosage; Radiographic Image Interpretation, Computer-Assisted - methods; Radiology; Sensitivity; Sensitivity analysis; Statistical analysis; Ultrasound; Sensitivity; Colonography, computed tomographic; Image reconstruction; Colonic polyp; Feasibility studies
• ISSN: 0938-7994; 1432-1084; 1432-1084
• DOI: 10.1007/s00330-018-5545-5

Objectives To assess the feasibility of ultra-low dose computed tomography colonography (CTC) using knowledge-based iterative reconstruction (IR) and to determine its effect on polyp detection. Methods Forty-nine prospectively-enrolled patients underwent ultra-low dose CTC in the supine (100 kVp/20 mAs) and prone positions (80 kVp/20 mAs), followed by same-day colonoscopy. Thereafter, images were reconstructed using filtered back projection (FBP) and knowledge-based IR (IMR; Philips Healthcare, Best, Netherlands) algorithms. Effective radiation dose of CTC was recorded. Pooled per-polyp sensitivity and positive predictive value of three radiologists was analysed and compared between FBP and IMR. Image quality was assessed on a five-point scale and image noise was recorded using standard deviations. Results Mean effective radiation dose of ultra-low dose CTC was 0.90 ± 0.06 mSv. Eighty-nine polyps were detected on colonoscopy (mean, 8.5 ± 4.7 mm). The pooled per-polyp sensitivity for polyps 6.0-9.9 mm ( n = 22) on CTC reconstructed with IMR (36/66, 54.5%) was not significantly different with that using FBP algorithm (34/66, 51.5%) ( p = 0.414). For polyps ≥10 mm ( n = 35), however, the pooled per-polyp sensitivity on CTC with IMR (73/105, 69.5%) was significantly higher than that with FBP (55/105, 52.4%) ( p < 0.001). In particular, the difference of per-polyp sensitivity was statistically significant in intermediate ( p = 0.014) and novice ( p = 0.003) reviewers. Furthermore, mean image noise of IMR (8.4 ± 6.2 HU) was significantly lower than that of FBP (37.5 ± 13.9 HU) ( p < 0.001) and image quality with IMR was significantly better than with FBP in all evaluated segments in all reviewers (all p s < 0.001). Conclusions Sub-mSv CTC reconstructed with IMR was feasible for the detection of clinically significant polyps, demonstrating 70% per-polyp sensitivity of polyps ≥10 mm, while allowing significant noise reduction and improvement in image quality compared with FBP reconstruction. Key Points • Sub-mSv CTC using IMR demonstrated 70% per-polyp sensitivity for polyps ≥10 mm. • CTC using IMR significantly outperformed CTC reconstructed with FBP. • IMR allows significantly more noise reduction and improvement in image quality than FBP.