Evaluation of a digital subtraction angiography unit
The operating characteristics of a digital subtraction aniography unit were evaluated. Measurements included image intensifier and system linearity, uniformity, quantum and system noise, and iodine contrast. Various approaches to noise measurement were analyzed and tested, leading to the following conclusions: the video level should be maximized; changes in signal-to-noise ratio (SNR) due to changes in x-ray exposure do not necessarily reflect changes in quantum SNR alone,due to dependence of video levels on x-ray exposure; and understanding of the separate contributions of quantum and video SNRs to the total SNR guides proper selection of variables to minimize patient dose and x-ray tube heat loading.
- Research Organization:
- Univ. of Texas Medical School, Houston
- OSTI ID:
- 6854748
- Journal Information:
- Radiology; (United States), Journal Name: Radiology; (United States) Vol. 144:3; ISSN RADLA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Digital subtraction angiography system evaluation with phantoms
Work in progress: the application of temporal filtering techniques to hybrid subtraction in digital subtraction angiography
Related Subjects
62 RADIOLOGY AND NUCLEAR MEDICINE
ALKALI METAL COMPOUNDS
AMIDES
BIOMEDICAL RADIOGRAPHY
BLOOD VESSELS
BODY
CARDIOVASCULAR SYSTEM
CONTRAST MEDIA
DIAGNOSTIC TECHNIQUES
DIGITAL SYSTEMS
ELECTROMAGNETIC RADIATION
EQUIPMENT
HYPAQUE
IMAGE INTENSIFIERS
IMAGE PROCESSING
IODINE ISOTOPES
IONIZING RADIATIONS
ISOTOPES
MEDICINE
NUCLEAR MEDICINE
OPERATION
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC IODINE COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANS
PROCESSING
RADIATIONS
RADIOLOGY
SIGNAL-TO-NOISE RATIO
SODIUM COMPOUNDS
X RADIATION
X-RAY EQUIPMENT