Carotid CT angiography: comparison of image quality for left versus right arm injections.
Summary of "Carotid CT angiography: comparison of image quality for left versus right arm injections."
To evaluate the differences in image quality of carotid computed tomographic angiography (CTA) of patients injected with contrast material in their right arms versus patients injected with contrast material in their left arms. MATERIALS AND
Patients who had cerebrovascular accidents and subsequently underwent CTA were included in the study. Contrast material was injected into the right arms of 44 patients and into the left arms of 46 patients. Source images of a total of 90 CTAs were retrospectively evaluated for perivenous streak artifacts and contrast material reflux into the veins of the neck and upper thorax. After adjusting for differences in gender, the relationship between the injection site and the intensity of perivenous streak artifacts and venous reflux was determined.
Perivenous streak artifacts and venous reflux were demonstrated in patients who underwent either right or left arm injections. However, the intensity of perivenous streak artifacts was stronger in patients who were injected with contrast material in the left arm. Venous reflux into the neck and upper thorax veins was also more severe and more frequent with left arm injections. A decreased retrosternal distance facilitated reversed flow into the veins when the left arm injection was used.
Perivenous beam hardening streak artifacts and venous reflux could not be prevented with right or left arm injections. However, patients who were injected with contrast material in their right arms showed fewer artifacts, thus allowing for better quality images on CTA.
Department of Radiology, Balikesir University School of Medicine, Balikesir, Turkey.
This article was published in the following journal.
Name: Diagnostic and interventional radiology (Ankara, Turkey)
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/20698005
- DOI: http://dx.doi.org/10.4261/1305-3825.DIR.3290-10.1
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Medical and Biotech [MESH] Definitions
A method of delineating blood vessels by subtracting a tissue background image from an image of tissue plus intravascular contrast material that attenuates the X-ray photons. The background image is determined from a digitized image taken a few moments before injection of the contrast material. The resulting angiogram is a high-contrast image of the vessel. This subtraction technique allows extraction of a high-intensity signal from the superimposed background information. The image is thus the result of the differential absorption of X-rays by different tissues.
The splitting of the vessel wall in one or both (left and right) internal carotid arteries (CAROTID ARTERY, INTERNAL). Interstitial hemorrhage into the media of the vessel wall can lead to occlusion of the internal carotid artery and aneurysm formation.
Improvement in the quality of an x-ray image by use of an intensifying screen, tube, or filter and by optimum exposure techniques. Digital processing methods are often employed.
Comparison of various psychological, sociological, or cultural factors in order to assess the similarities or diversities occurring in two or more different cultures or societies.
Damages to the CAROTID ARTERIES caused either by blunt force or penetrating trauma, such as CRANIOCEREBRAL TRAUMA; THORACIC INJURIES; and NECK INJURIES. Damaged carotid arteries can lead to CAROTID ARTERY THROMBOSIS; CAROTID-CAVERNOUS SINUS FISTULA; pseudoaneurysm formation; and INTERNAL CAROTID ARTERY DISSECTION. (From Am J Forensic Med Pathol 1997, 18:251; J Trauma 1994, 37:473)