Back to Search
Start Over
Management of patient dose and image noise in routine pediatric CT abdominal examinations.
Management of patient dose and image noise in routine pediatric CT abdominal examinations.
- Source :
- European Radiology; May2004, Vol. 14 Issue 5, p835-841, 7p
- Publication Year :
- 2004
-
Abstract
- The aim was to propose a strategy for finding reasonable compromises between image noise and dose as a function of patient weight. Weighted CT dose index (CTDI(w)) was measured on a multidetector-row CT unit using CTDI test objects of 16, 24 and 32 cm in diameter at 80, 100, 120 and 140 kV. These test objects were then scanned in helical mode using a wide range of tube currents and voltages with a reconstructed slice thickness of 5 mm. For each set of acquisition parameter image noise was measured and the Rose model observer was used to test two strategies for proposing a reasonable compromise between dose and low-contrast detection performance: (1) the use of a unique noise level for all test object diameters, and (2) the use of a unique dose efficacy level defined as the noise reduction per unit dose. Published data were used to define four weight classes and an acquisition protocol was proposed for each class. The protocols have been applied in clinical routine for more than one year. CTDI(vol) values of 6.7, 9.4, 15.9 and 24.5 mGy were proposed for the following weight classes: 2.5-5, 5-15, 15-30 and 30-50 kg with image noise levels in the range of 10-15 HU. The proposed method allows patient dose and image noise to be controlled in such a way that dose reduction does not impair the detection of low-contrast lesions. The proposed values correspond to high- quality images and can be reduced if only high-contrast organs are assessed. [ABSTRACT FROM AUTHOR]
- Subjects :
- PHARMACY
WEIGHTS & measures
MEDICAL protocols
PHARMACEUTICAL arithmetic
DIAGNOSIS
MEDICAL care
ABDOMINAL radiography
BODY weight
COMPARATIVE studies
COMPUTED tomography
DIAGNOSTIC imaging
DIGITAL image processing
MATHEMATICAL models
RESEARCH methodology
MEDICAL cooperation
RADIATION doses
RADIATION measurements
RESEARCH
SIGNAL processing
THEORY
EVALUATION research
MEDICAL artifacts
RADIOLOGIC technology
Subjects
Details
- Language :
- English
- ISSN :
- 09387994
- Volume :
- 14
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- European Radiology
- Publication Type :
- Academic Journal
- Accession number :
- 15655079
- Full Text :
- https://doi.org/10.1007/s00330-003-2206-z