Computed tomography angiography in children with cardiovascular disease: low dose techniques and image quality
| Autor: | Sadaf T. Bhutta, S. Bruce Greenberg, Frandics P. Chan, Leah E. Braswell |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Heart Defects
Congenital medicine.medical_specialty Image quality Cardiac-Gated Imaging Techniques Coronary Angiography Radiation Dosage Effective dose (radiation) Electrocardiography Hounsfield scale Statistical significance Medical imaging Medicine Humans Radiology Nuclear Medicine and imaging cardiovascular diseases Cardiac imaging Computed tomography angiography medicine.diagnostic_test business.industry musculoskeletal neural and ocular physiology Infant Reproducibility of Results Child Preschool Angiography Radiographic Image Interpretation Computer-Assisted Radiology Cardiology and Cardiovascular Medicine business Nuclear medicine Tomography X-Ray Computed Tomography Spiral Computed psychological phenomena and processes |
| Zdroj: | The international journal of cardiovascular imaging. 28(1) |
| ISSN: | 1875-8312 |
| Popis: | Dose reduction techniques for computed tomography angiography (CTA) in children with cardiovascular diseases have the potential of reducing risks of radiation-induced cancer. To evaluate effectiveness of these techniques, both radiation dose and image quality must be compared. While clinically practical methods of estimating effective dose are available, there are no generally accepted metrics for the assessment of image quality in CTA. We introduce a measurable and reproducible image quality index, CTA QI. Using this index, along with calculated effective dose, we test the hypothesis that volume scan CTA delivers comparable image quality at substantially reduced radiation dose when compared to helical CTA. CTA QI is a measure of intraluminal contrast variation in three-dimensions, and it is calculated from standardized measurements of means and standard deviations of Hounsfield units in the thoracic descending aorta. From institutional database, 83 studies of CTA for thoracic cardiovascular diseases were retrospectively identified. CTA QI values were independently measured by two radiologists and compared using correlation. CTA QI and DLP-derived effective dose were compared for the following groups: non-cardiac gated wide-detector and helical CTA, ECG-synchronized retrospective wide-detector and helical CTA, ECG-synchronized wide detector retrospective and target technique CTA. Statistical significance was evaluated with the Student—t test. The correlations of CTA QI values between the radiologists were 0.83 and 0.92 for non-gated studies and ECG-synchronized studies respectively. Comparing non-gated volume scan CTA to helical CTA, there was a radiation dose reduction of 69% (P |
| Databáze: | OpenAIRE |
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