Enter Your Search:
Results 1-3 (3)
Go to page number:
Select a Filter Below
Cardiovascular and Interventional Radiology (1)
Journal of Digital Imaging (1)
Pediatric Radiology (1)
Balter, Stephen (3)
Bartal, Gabriel (1)
Cardella, John F. (1)
Dixon, Robert (1)
Geiger, Bernhard (1)
Martinez, Luis C. (1)
Miller, Donald L. (1)
Padovani, Renato (1)
Schueler, Beth (1)
Ubeda, Carlos (1)
Vano, Eliseo (1)
Vañó, Eliseo (1)
de Baère, Thierry (1)
Year of Publication
Influence of Image Metrics When Assessing Image Quality from a Test Object in Cardiac X-ray Systems
Martinez, Luis C.
Journal of Digital Imaging
Modern fluoroscopic systems used for invasive cardiology typically acquire digital images in a 1,024 × 1,024 × 12 bits. These images are maintained in the original format while they remain on the imaging system itself. However, images are usually stored using a reduced 512 × 512 × 8-bits format. This paper presents a method for digital analysis of test objects images. The results obtained using image-intensifier and flat-detector systems are given for the original and reduced matrices. Images were acquired using a test object (TO) and a range of polymethyl methacrylate (PMMA) thicknesses from 4 to 28 cm. Adult patient protocols were evaluated for 16–28 cm of PMMA using the image-intensifier system. Pediatric protocols were evaluated for 4–16 cm of PMMA using the flat-detector system. The TO contains disks of various thicknesses to evaluate low contrast sensitivity and a bar pattern to evaluate high-contrast spatial resolution (HCSR). All available fluoroscopic and cine modes were evaluated. Entrance surface air kerma was also measured. Signal-to-noise ratio (SNR) was evaluated using regions of interest (ROI). HCSR was evaluated by comparing the statistical analysis of a ROI placed over the image of the bar pattern against a reference ROI. For both systems, an improvement of approximately 20% was observed for the SNR on the reduced matrices. However, the HCSR parameter was substantially lower in the reduced metrics. Cardiologists should consider the clinical influence of reduced spatial resolution when using the archived images.
Image quality; test object; matrix size; catheterization; cardiology
Occupational Radiation Protection in Interventional Radiology: A Joint Guideline of the Cardiovascular and Interventional Radiology Society of Europe and the Society of Interventional Radiology
Miller, Donald L.
Cardella, John F.
de Baère, Thierry
Cardiovascular and Interventional Radiology
Methods for measuring fluoroscopic skin dose
This paper briefly reviews available technologies for measuring or estimating patient skin dose in the interventional fluoroscopic environment.
Fluoroscopic skin dose; Interventional radiography
Results 1-3 (3)
Go to page number:
Remove citation from clipboard
Add citation to clipboard
This will clear all selections from your clipboard. Do you wish proceed?
Clipboard is full! Please remove an item and try again.
PubMed Central Canada is a service of the
Canadian Institutes of Health Research
(CIHR) working in partnership with the National Research Council's
Canada Institute for Scientific and Technical Information
in cooperation with the
National Center for Biotechnology Information
U.S. National Library of Medicine
(NCBI/NLM). It includes content provided to the
PubMed Central International archive
by participating publishers.