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Dye
 
A dye is usually a coloring agent. In medical imaging the term dye refers to radiopaque material used during x-ray examinations to provide or increase contrast in the different tissues and organs. Dye usually refers to intravenous contrast agents.
See also Contrast Agents.
 
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Contrast Dye
 
See Dye, Contrast Agents.
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Radiopaque Dye
 
See Contrast Agents and Dye.
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Abdomen CT
 
A computed tomography (CT) of the abdomen images the region from the thoracic diaphragm to the pelvic groin. The computed tomography technique uses x-rays to differentiate tissues by their different radiation absorption rates.
Oral contrast material can be given to opacify the bowel before scanning. An i.v. injection of a contrast agent (x-ray dye) improves the visualization of organs like liver, spleen, pancreas and kidneys and provides additional information about the blood supply.
Spiral- or helical CT, including improvements in detector technology support faster image acquisition with higher quality. Advanced CT systems can usually obtain a CT scan of the whole abdomen during a single breath hold. This speed increases the detection of small lesions (caused by differences in breathing on consecutive scans) and is beneficial especially in pediatric, elderly or critically-ill patients.
Changes in patient weight require variations in x-ray tube potential to maintain constant detector energy fluence. An increased x-ray tube potential improves the contrast to noise resolution (CNR).

An abdominal CT is typically used to help diagnose the cause of abdominal pain and diseases such as:
point appendicitis, diverticulitis;
point kidney and gallbladder calcifications;
point abscesses and inflammations;
point cancer, metastases and other tumors;
point pancreatitis;
point vascular disorders.

Other indications for CT scanning of the abdomen/pelvis include planning radiation treatments, guide biopsies and other minimally invasive procedures. Advanced techniques include for example 3D CT angiography, multiphasic contrast-enhanced imaging, virtual cystoscopy, virtual colonoscopy, CT urography and CT densitometry.
See also Contrast Enhanced Computed Tomography.


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Impact of Abdominal CT on the Management of Patients Presenting to the Emergency Department with Acute Abdominal PainOpen this link in a new window
'OBJECTIVE. The purpose of this study is to document the impact of CT performed in the emergency department of patients presenting ...'
Monday, 23 August 1999 by www.ajronline.org    
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Administration
 
Administration in medical imaging refers to the administration of contrast agent (dye) or radioactive material (radiopharmaceutical) into the body by injection, oral administration or by other route.

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