CCD camera for dual-energy digital subtraction angiography

Journal Article · Fri Dec 01 04:00:00 EST 1995 · IEEE Transactions on Medical Imaging

DOI:https://doi.org/10.1109/42.476115· OSTI ID:182944

Molloi, S; Ersahin, A; Qian, Y J ^[1]

---

1. Univ. of California, Irvine, CA (United States)

A motion immune dual-energy subtraction technique in which x-ray tube voltage and beam filtration were switched at 30 Hz between 60 kVp (2.0 mm Al filter) and 120 kVp (2.0 mm Al + 2.5 mm Cu filter) was previously reported. In this study, the effects of camera lag on the dual-energy iodine signal is investigated. The temporal lag of the lead oxide vidicon tested reduced the dual-energy iodine signal by a factor of 2.3, as compared to a mode that included 4 scrub frames between low- and high-energy images, for an iodine phantom with thicknesses of 0--86.0 mg/cm{sup 2}, imaged over a 15 cm thick Lucite phantom. On the other hand, the Charge-Coupled Device (CCD) camera has inherently no temporal lag and its versatile scanning characteristics make it near ideal for dual-energy DSA. The CCD camera eliminates the reduction of dual-energy iodine signal, since it does not mix low- and high-energy image data. Another benefit of the CCD camera is that the separation time between low and high-energy images is not limited to the frame period, as is the lead oxide vidicon; and as small as a 5-msec time difference is possible. The short time interval between low and high-energy images minimizes motion misregistration artifacts. Due to these advantages, the CCD camera significantly improves the utility of dual-energy DSA.

• OSTI ID: 182944
• Journal Information: IEEE Transactions on Medical Imaging, Journal Name: IEEE Transactions on Medical Imaging Journal Issue: 4 Vol. 14; ISSN 0278-0062; ISSN ITMID4
• Country of Publication: United States
• Language: English

Related Subjects

55 BIOLOGY AND MEDICINE
BASIC STUDIES
BIOMEDICAL RADIOGRAPHY
CAMERAS
CHARGE-COUPLED DEVICES
CORONARIES
EFFICIENCY
IMAGE PROCESSING
MATHEMATICAL MODELS
OPTIMIZATION
PHANTOMS
X RADIATION