Coronary CT angiography using iterative reconstruction 
vs. filtered back projection: evaluation of image quality

Coronary CT angiography using iterative reconstruction 
vs. filtered back projection: evaluation of image quality

Authors

  • Teresa Arcadi Department of Radiology, SDN IRCCS, Naples, Italy
  • Erica Maffei Cardiovascular Imaging Unit, Department of Radiology, Giovanni XXIII Clinic, Monastier di Treviso, Treviso, Italy
  • Cesare Mantini Department of Radiology, University of Chieti, Italy
  • Andrea Guaricci Department of Cardiology, University of Foggia, Italy
  • Ludovico La Grutta Department of Radiology, University of Palermo, Italy
  • Chiara Martini Cardiovascular Imaging Unit, Department of Radiology, Giovanni XXIII Clinic, Monastier di Treviso, Treviso, Italy
  • Filippo Cademartiri Cardiovascular Imaging Unit, Department of Radiology, Giovanni XXIII Clinic, Monastier di Treviso, Treviso, Italy

Keywords:

iterative reconstruction, signal, noise, cardiac CT, filtered back projection

Abstract

Objectives: To compare image quality of iterative reconstruction algorithm(IRIS) vs. standard filtered back projection(FBP) reconstruction in CT Coronary Angiography (CTCA). Materials and methods: Thirty-four consecutive patients underwent CTCA for suspected or known CAD with Dual-Source CT (DSCT-Flash, Siemens). All datasets were reconstructed with 0.75/0.4 and 0.6/0.4 mm slice thickness/increment, using three standard FBP kernels (B26-B30-B46) and three comparable IRIS algorithms (I26-I30-I46). Vascular attenuation and noise were measured. CT vascular attenuation values [HU] were measured in: ascending aorta (Ao), right (RCA) and left (LCA) coronary artery, respectively. Signal-to-noise (SNR) and contrast-to-noise (CNR) ratio were calculated. A p-value<0.05 was considered significant. Results: There was no significant difference between the vascular attenuation values measured with FBP (Ao:458HU, RCA:448HU, LAD:444HU) and IRIS (Ao:456HU, RCA:446HU, LAD:442HU). Difference in noise was significant between FBP (24±SD) and IRIS (19±SD) (r=0.34;p<0.05). Lowest noise was found for IRIS using 0.6 mm (17HU). IRIS provided a SNR and CNR significantly higher with increasing kernel sharpness. SNR was 33.3±25.1, 77.3±51.7, 37.2±36.6, 64.4±59.2, while CNR was 25.32±19.8, 58.0±36.0, 28.6±23.5, 47.6±47.3 for 0.75B, 0.75I, 0.6B and 0.6I, respectively. IRIS showed an improvement in SNR of 57% and 56% for 0.75 mm and 0.6 mm, respectively, and an improvement in CNR of 42% and 40% for 0.75 mm and 0.6 mm. Conclusions: In CTCA, iterative reconstructions provide a significant higher image quality compared with the conventional FBP reconstructions. (www.actabiomedica.it)

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Published

27-04-2015

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Section

ORIGINAL ARTICLES

How to Cite

1.
Coronary CT angiography using iterative reconstruction 
vs. filtered back projection: evaluation of image quality. Acta Biomed [Internet]. 2015 Apr. 27 [cited 2024 Jun. 18];86(1):77-85. Available from: https://mattioli1885journals.com/index.php/actabiomedica/article/view/3511

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