Adaptive statistical iterative reconstruction (ASIR) algorithm for CT dose reduction in hematological malignancies: a practical approach and literature review

Congress:

EuroSafe Imaging 2016

Poster Number:

ESI-0027

Type:

EuroSafe Imaging

Keywords:

Action 6 - Education and training in medical radiation protection, Action 8 - Radiation protection training and learning material

Authors:

R. A. Capsa, A. C. Nicolae, M. Ranete, C. Scheau, I. G. Lupescu

DOI:

10.1594/esi2016/ESI-0027

DOI-Link:

https://dx.doi.org/10.1594/esi2016/ESI-0027

Fig. 3: Mediastinal mass: arrow

Fig. 1: Peripancreatic fat infiltration: circle

Fig. 2: Small pulmonary lesion: circle

Fig. 4: Vertebral hemangioma

Background/Introduction

Hematological malignancies represent a major indication for CT exploration in our imaging department. The patients undergoing CT exams are either at their initial assessment of disease status, or reviewed for outcome reassessment intheir follow-up.There is a wide age variability of the patients requiring a CT examination, including children, adults and elderly people. Since most of the patients require regular CT follow-up studies, there is major raising concern with reference not to harm these patients even more with unnecessary high radiation doses. Therefore, since we use...

Description of activity and work performed

We have managed to scan a small group of 7 adult patients with follow-up CT examinations for malignant lymphoma (Hodgkin and non-Hodgkin) by using a low radiation dose and adaptive statistical IR and we have assessed the current studies in comparison with previous CT examinations scanned in full dose regimens, with standard filtered-back projection. The scanner used for all examinations has been a GE Optima 64 slice and the iterative reconstruction technique was adaptive statistical iterative reconstruction (ASIR).The area of coverage comprised thorax, abdomen and...

Conclusion and Recommendations

In conclusion, we have found that ASIR reconstruction of a single phase post contrast study froma low dose radiation regime did not show any deleterious effects on the efficiency of final diagnosis or conspicuity of any important lesion in patients performing follow-up CT explorations in hematologic malignancies. We did not find radically lowerimage quality inthe low-dose regimen with ASIR compared with the standard-dose one reconstructed with filtered-back projection. However, one should consider that in large patients, a more customized ASIR parameter might be necessary in...

Personal/Organisational information

Carol Davila University of Medicine and Pharmacy, Bucharest, Romania Radiology, Medical Imaging and Interventional RadiologyDeparment, Fundeni Clinical Institute, Bucharest

References

Silva AC, Lawder HJ et al: Innovations in CT dose reduction strategy: application of the adaptive statistical iterative reconstruction algorithm,AJR Am J Roentgenol. 2010 Jan;194(1):191-9; Barnes E:ASIR reconstruction sharpens images, slices abdominal CT dose, online paper AuntMinnie.com, May 20, 2009; Meyer, M., Klein SA et al: Whole-body CT for lymphoma staging: Feasibility of halving radiation dose and risk by iterative image reconstruction, European Journal of Radiology 2013 Dec; 83(2): 315 - 321; Boning G, Schafer M. et al: Comparison of applied dose and image quality...