Advanced modelled iterative reconstruction for abdominal CT: qualitative and quantitative evaluation.
Clin Radiol
; 69(12): e497-504, 2014 Dec.
Article
in En
| MEDLINE
| ID: mdl-25239788
ABSTRACT
AIM:
To determine qualitative and quantitative image-quality parameters in abdominal imaging using advanced modelled iterative reconstruction (ADMIRE) with third-generation dual-source 192 section CT. MATERIALS ANDMETHODS:
Forty patients undergoing abdominal portal-venous CT at different tube voltage levels (90, 100, 110, and 120 kVp, n = 10 each) and 10 consecutive patients undergoing abdominal non-enhanced low-dose CT (100 kVp, 60 mAs) using a third-generation dual-source 192 section CT machine in the single-source mode were included. Images were reconstructed with filtered back projection (FBP) and ADMIRE (strength levels 1-5). Two blinded, independent readers subjectively determined image noise, artefacts, visibility of small structures, and image contrast, and measured attenuation in the liver, spleen, kidney, muscle, fat, and urinary bladder, and objective image noise.RESULTS:
Subjective noise was significantly lower and image contrast significantly higher for each increasing ADMIRE strength level and also for ADMIRE 1 compared to FBP (all, p < 0.001). No significant differences were found for artefact and visibility ratings among image sets (all, p > 0.05). Attenuation was similar across tube voltage-image datasets in all anatomical regions (all, p > 0.05). Objective noise was significantly lower for each increasing ADMIRE strength level, and for ADMIRE 1 compared to FBP (all, p < 0.001, maximal reduction 53%). Independent predictors of noise were tube voltage (p < 0.05) and current (p < 0.001), diameter (p < 0.05), and reconstruction algorithm (p<0.001); the amount of noise reduction was related only to the reconstruction algorithm (p < 0.001).CONCLUSION:
Abdominal CT using ADMIRE results in an improved image quality with lower image noise as compared with FBP, while the attenuation of various anatomical regions remains constant among reconstruction algorithms.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Image Processing, Computer-Assisted
/
Radiography, Abdominal
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Radiographic Image Interpretation, Computer-Assisted
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Tomography, X-Ray Computed
Type of study:
Diagnostic_studies
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Evaluation_studies
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Observational_studies
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Prognostic_studies
/
Qualitative_research
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Risk_factors_studies
Limits:
Adult
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Aged
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Aged80
/
Female
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Humans
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Male
/
Middle aged
Language:
En
Journal:
Clin Radiol
Year:
2014
Document type:
Article
Affiliation country:
Switzerland