The impact of iterative reconstruction on image quality and radiation dose in thoracic and abdominal CT
| Autor: | Eva Hassler, Helmut Schöllnast, Andre Lutfi, Jürgen Steiner, Peter Kalmar, Franz Quehenberger, Emina Talakic, Dennis Bohlsen |
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| Rok vydání: | 2014 |
| Předmět: |
Adult
Male Radiography Abdominal medicine.medical_specialty Adolescent Image quality Computed tomography dose index Iterative reconstruction Radiation Dosage McNemar's test Hounsfield scale Image noise Humans Medicine Radiology Nuclear Medicine and imaging Child Aged Aged 80 and over business.industry General Medicine Middle Aged Quality Improvement medicine.anatomical_structure Radiographic Image Interpretation Computer-Assisted Abdomen Female Radiography Thoracic Radiology Tomography X-Ray Computed business Nuclear medicine Student's t-test |
| Zdroj: | European Journal of Radiology. 83:1416-1420 |
| ISSN: | 0720-048X |
| Popis: | 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.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.There was no significant difference between the protocols in terms of mean scan length (p0.05). 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, p0.05). 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, p0.001) for thoracic CT and by 58% (7.8 ± 4.6 mGy versus 18.5 ± 8.6 mGy, p0.001) for abdominal CT.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. |
| Databáze: | OpenAIRE |
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