X-ray image (angiogram/arteriogram) of blood vessels and heart chambers is obtained after contrast is injected through a catheter into the appropriate blood vessel or heart chamber.
contrast or air or both are injected into a joint and x-ray images of the joint are obtained.
A radiopaque medium that is mixed in water and used for examination of the upper and lower GI tract. Is either swallowed or given in an enema.
barium enema (BE)
Lower GI series that opacifies the lumen (passageway) of the large intestine using an enema containing barium sulfate.
A type of tracer study where 99m Tc (technetium) is used to label phosphate substances and then is injected intravenously. The phosphate compound is taken up by bone and the skeleton is imaged in 2 or 3 hrs (so most of compound is excreted in urine). Scan detects infection, inflammation, or tumors involving the skeleton (appear as hot spots).
computed tomography (CT)
Diagnostic x-rays at multiple angles thru a section of the body. Creates multiple views, especially cross-sectional. Scanner sensitivity is increased by using an iodine-containing contrast agent which outlines blood vessels. Used to detect bone disease and organs.
64-slice CT scanner
New ultrafast scanner that can product a 3-D image of a beating heart and surrounding blood vessels.
an x-ray study using a contrast medium injected to obtain a contrast with surrounding tissue and visualize a specific part, organ, tube or liquid as a negative imprint.
Use of motion picture techniques to record a series of x-ray images during fluoroscopy. Brightens fluoroscopic images to obtain a permanent record of an x-ray or fluoroscopy.
An ultrasound technique projecting a brightly colored, high-velocity jet of material thru a passageway or organ.
digital subtraction angiography (DSA)
X-ray image of contrast-injected blood vessels is produced by taking 2 x-rays (the first without contrast) and using a computer to subtract obscuring shadows from the 2nd image.
digital imaging techniques
Used to enhance conventional and fluoroscopic x-rays. Lower dose of x-ray is used. Beneficial when needing to send via networks for additional diagnostic input.
Records blood flow velocity (in diagnosing vascular disease) and image major blood vessels in patients at risk for stroke.
digital image communication in medicine - standard protocol for transmission between imaging devices (eg CT scans and PACS workstations).
Uses both radiopaque and radiolucent contrast medium. Ex: walls of stomach or intestine are coated with barium and the lumen is filled with air. Radiographs show pattern of mucosal ridges).
Ultrasound imaging used by cardiologists to detect heart valve and blood vessel disorders.
X-ray procedure that uses an image intensifier (fluorescent screen) instead of a photographic plate to derive a visual image from the x-rays that pass thru the patient. The fluorescent screen glows when struck by x-rays. Advantage: internal organs can be observed in motion and patient's position can be changed constantly to provide the best possible diagnostic view. Opaque tissue (like bone) appear like a dark shadow image.
rays of light energy emitted as a result of exposure to and absorption of radiation from x-rays.
High-energy rays emitted by radioactive substances in tracer studies used as a diagnostic label to trace the path and uptake of chemical substances in the body. One of 3 types of radioactivity.
Most commonly used contrast agent in an MRI exam. Enhances vessels and tissues, increases sensitivity for lesion detection, and helps differentiate between normal and abnormal tissues and structures.
A type of tracer study where the radioisotope gallium 67 is injected intravenously and used in whole-body scans. Has an affinity for tumors, non-neoplastic lesions like abscesses, and areas of inflammation as occur in pneumonitis.
machine to detect gamma rays emitted from radiopharmaceuticals during scanning for diagnostic purposes.
X-ray record of endometrial cavity and fallopian. Obtained after injection of contrast material thru the vagina and into the endocervical canal. Determines the patency of the fallopian tubes.
the time required for a radioactive substance to lose half of its radioactivity by disintegration. This knowledge important in determining how long the substance will emit radioactivity when in the body. Must be long enough for diagnostic imaging but as short as possible to minimize patient exposure to radiation.
An ultrasound of the uterine cavity. Saline solution is injected thru a catheter inserted thru the vagina and into the endocervical canal to distend the uterine cavity.
a chemical process where the energy of an x-ray beam causes rearrangement and disruption within a substance so that previously neutral particles are changed to charged particles called ions.
Radiopaque fluids containing up to 50% iodine used in: angiography, arthrography, cholangiography, DSA, hysterosalpingography, myelography, pyelography, and urography.
Invasive procedures (therapeutic or diagnostic) performed by a radiologist under fluoroscopic, CY and MR guidance. Includes: percutaneous biopsies, placement of drainage catheters, drainage of abscesses, oculsion of bleeding vessels, and catheter instillation of antibiotics or chemotherapy.
"in the test tube" - Procedures involving analysis of blood and urine specimens using radioactive chemicals. Ex: radioimmunoassay combines use of radioactive chemicals and antibodies to detect hormones and drugs in a patient's blood. Allows detection of minute amounts of substances or compounds. Used often to check digitalis levels.
"in the body" - traces amounts of radioactive substances within the body. Given directly to the patient to evaluate the function of an organ or to image it. Ex: Tracer studies.
radioactive iodine - used in thyroid, liver and kidney scans and for treatment of malignant and nonmalignant conditions of the thyroid.
Side-to-side. For example, In left lateral view x-rays travel from a source located to the right of the patient to a detector placed to the left of the patient.
A radiopharmaceutical is given intravenously or by inhalation of a gas or aerosol which fills the air sacs (alveoli).
liver and spleen scans
To visualize these organs, a radiopharmaceutical is injected intravenously & images are taken with a gamma camera. Liver scan can detect cirrhosis, abscesses, tumors, hepatomegaly and hepatitis. A spleen scan can detect splenomegaly due to tumor, cyst, abscess, or rupture.
X-ray imaging of spinal cord after contrast injected into subarachnoid space surrounding the spinal cord. Usually performed on patients who cannot undergo MRI.
magnetic resonance imaging. Uses electromagnetic energy to produce saggital, coronal (frontal) and axial images. Performed with and without contrast. If using contrast, most common agent is gadolinium (Gd). Excellent soft tissue images. Detects edema in brain, direct image of spinal cord, detects tumors in chest and abdomen, visualizes cardiovascular system. NOT USED for patients with pacemakers or metallic implants.
medical specialty that studies the characteristics and uses of radioactive substances in the diagnosis of disease.
nuclear medicine technologist
attends to patients undergoing nuclear medicine procedures and operate devices under the direction of a nuclear physician.
x-rays travel in a slanting direction at an angle from the perpendicular plane. show regions or structures ordinarily hidden and superimposed in route PA and AP views.
x-ray imaging of the renal pelvis and urinary tract. Contrast injected into a vein or thru a catheter placed thru the urethra, bladder, or ureter and into renal pelvis
lung perfusion studies
scan using radiopharmaceutical that moves through the capillaries of the lungs. Helps to diagnose pulmonary thrombosis.
positron emission tomography (PET scan)
Radioactive technique that produces images of the distribution of radioactivity in a region of the body. Similar to a CT scan, but radioisotopes are used (via IV) instead of contrast and x-rays. Used to pinpoint areas of metabolic deficiency and organ function so useful in diagnosing stroke, epilepsy, Alzheimer disease and brain tumors as well as abdominal and pulmonary malignancies.
picture archival and communications system - replacement of traditional films with digital equivalents that can be accessed from several places and retrieved more rapidly.
allied health care professionals who work with physicians in the fields of radiology and nuclear medicine.
substance that permits passage of most of the x-rays. Ex: lung tissue - appears black. Also air (most transmission), fat, water & metal.
radiofrequency ablation (RFA)
removal of tumors and tissues (liver, kidney, adrenals) performed by interventional radiologists.
An in vitro procedure that combines the use of radioactive chemicals and antibodies to detect hormones and drugs in a patient's blood. Allows detection of minute amounts. Esp. helpful with checking digitalis blood levels.
radiopharmaceutical (or radiolabeled compound)
The combination of a radionuclide and a drug or chemical. Designed to concentrate in a certain organ.
procedure of making an image to track the distribution of radioactive substance in the body.
small bowel follow-through (SBFT)
Traces the passage of barium in a sequential manner as it passes through the small intestine. A type of contrast study.
single photon emission computed tomography
SPECT - IV injection of a radioactive tracer (like technetium-99m) and computer reconstruction of a 3D images based on a composite of many views. Used to detect liver tumors, cardiac ischemia, and evaluating bone disease of the spine.
transducer (or probe)
Handheld instrument that is placed near or on the skin, covered with a thin coating of gel, and emits sound waves in short, repetitive pulses. Used in ultrasonography.
a pure gamma emitter with a half-life of 6 hours. The most frequently used radionuclide in diagnostic imaging.
A specific radionuclide is incorporated into a chemical substance and administered to a patient to evaluate the function of an organ or to image it.
Technetium Tc-99m sestamibi (Cardiolite) scan
this radiopharmaceutical is injected intravenously and traced to the heart muscle. If an exercise tolerance test (ETT) is used with it it becomes an ETT-MIBI scan.
Thallium (TI) scan
Thallium-201 (201Tl) is injected intravenously to evaluate myocardial perfusion. A high concentration indicated in a well-perfused heart muscle cells. Infarcted or scarred myocardium doesn't extract any thallium and shows up as "cold spots".
usually iodine-131 is administered intravenously and scan revels the size and shape of thyroid gland. Hyperfunctioning thyroid accumulates higher amounts of 131I. Thyroid carcinoma doesn't concentrate the iodine well and is seen as a "cold spot".
Ultrasound imaging that uses high-frequency, inaudible sound waves that bounce off body tissues and are then recorded to give info about the anatomy of an internal organ.
ventilation-perfusion scan (V/Q scan)
Radiopharmaceutical is inhaled (ventilation) and injected intravenously (perfusion) followed by imaging its passage through the respiratory tract.