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Kalmar, PI; Quehenberger, F; Steiner, J; Lutfi, A; Bohlsen, D; Talakic, E; Hassler, EM; Schöllnast, H.
The impact of iterative reconstruction on image quality and radiation dose in thoracic and abdominal CT.
Eur J Radiol. 2014; 83(8):1416-20 Doi: 10.1016/j.ejrad.2014.05.017
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Führende Autor*innen der Med Uni Graz
Kalmar Peter
Schoellnast Helmut
Co-Autor*innen der Med Uni Graz
Bohlsen Dennis
Hassler Eva Maria
Lutfi Andre
Quehenberger Franz
Steiner Jürgen
Talakic Emina

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PURPOSE: To compare the image quality and radiation dose between iterative reconstruction (IR) and standard filtered back projection (FBP) in CT of the chest and abdomen. MATERIALS AND METHODS: Thoracic CT was performed in 50 patients (38 male, 12 female; mean age, 51 ± 23 yrs; range, 7-85 yrs) and abdominal CT was performed in 50 patients (36 male, 14 female; mean age, 62 ± 13 yrs; range, 20-85 yrs), using IR as well as FBP for image reconstruction. Image noise was quantitatively assessed measuring standard deviation of Hounsfield Units (HU) in defined regions of interest in subcutaneous tissue. Scan length and Computed Tomography Dose Index (CTDI) were documented. Scan length, image noise, and CTDI of both reconstruction techniques were compared by using paired tests according to the nature of variables (McNemar test or Student t test). Overall subjective image quality and subjective image noise were compared. RESULTS: There was no significant difference between the protocols in terms of mean scan length (p>0.05). Image noise was statistically significantly higher with IR, although the difference was clinically insignificant (13.3 ± 3.0 HU and 13.6 ± 3.0 HU for thoracic CT and 11.5 ± 3.1 HU and 11.7 ± 3.0 HU for abdominal CT, p<0.05). There was no significant difference in overall subjective image quality and subjective image noise. The radiation dose was significantly lower with IR. Volume-weighted CTDI decreased by 64% (6.2 ± 2.5 mGy versus 17.1 ± 9.5 mGy, p<0.001) for thoracic CT and by 58% (7.8 ± 4.6 mGy versus 18.5 ± 8.6 mGy, p<0.001) for abdominal CT. CONCLUSIONS: Our study shows that in thoracic and abdominal CT with IR, there is no clinically significant impact on image quality, yet a significant radiation dose reduction compared to FBP.
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Adolescent - administration & dosage
Adult - administration & dosage
Aged - administration & dosage
Aged, 80 and over - administration & dosage
Child - administration & dosage
Female - administration & dosage
Humans - administration & dosage
Male - administration & dosage
Middle Aged - administration & dosage
Quality Improvement - administration & dosage
Radiation Dosage - administration & dosage
Radiographic Image Interpretation, Computer-Assisted - methods
Radiography, Abdominal - administration & dosage
Radiography, Thoracic - administration & dosage
Tomography, X-Ray Computed - methods

Find related publications in this database (Keywords)
Computed tomography
Iterative reconstruction
Filtered back projection
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