RAD-285 CT

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  1. matrix
    array of numbers arranged in a grid of rows and columns
  2. each square or two dimensional box or picture element
  3. what is a slice thickness that applies to each pixel depth dimension
  4. dense tissues are assigned what number
    any tissue less dense than water is assigned a
    • positive
    • negative
  5. the extension or contraction of the helix is termed the
  6. what are three charactteristics in beam geometry
    • parallel
    • fan
    • spire
  7. what is the pre patient collimator
    determines dose profile to the patient by limiting the area of the pt wxpose by the useful beam
  8. what is a predetector collimator
    located at the detector entrance and restricts the xray beam viweed  by the detector arrray by reducing
  9. what is the data aqcuisition factor
    refers to the set pf detectors electronic that are positioned between the detector array and comp.
  10. what is a multiplanar reformation
    multislice spiral ct can takr acquired data set and reformat into 3d image or view body in other planes
  11. what is the partial volume effect
    • When
    • the data is averaged for an entire section thickness, small structures or
    • portions of large structures may be hidden if they are only a small percentage
    • of the slice.
  12. angio
    • •An
    • X-ray exam of the arteries and veins to diagnose blockages and other blood
    • vessel problems; uses a catheter to enter the blood vessel and a contrast agent
    •  to make the artery or vein visible on the
    • X-ray.
  13. ballon angio
    • •Opens
    • blocked or narrowed blood vessels by inserting a very small balloon into the
    • vessel and inflating it. Used by IRs to unblock clogged arteries in the legs or
    • arms (called peripheral vascular disease or PVD), kidneys, brain or elsewhere
    • in the body.
  14. Biliary drainage and stenting
    • •Uses
    • a stent (small mesh tube) to open up blocked ducts and allow bile to drain from
    • the liver.
  15. Central venous access
    • •Insertion
    • of a tube beneath the skin and into the blood vessels so that patients can
    • receive medication or nutrients directly into the blood stream or so blood can
    • be drawn.
  16. Chemoembolization
    • •Delivery
    • of cancer-fighting agents directly to the site of a cancer tumor; currently
    • being used mostly to treat cancers of the endocrine system, including melanoma
    • and liver
    • cancers.
  17. Embolization
    • •Delivery
    • of clotting agents (coils, plastic particles, gelfoam, etc.) directly to an area that is
    • bleeding or to block blood flow to a problem area, such as an aneurysm or a
    • fibroid tumor in the uterus.
  18. Gastrostomy tube
    • •Feeding
    • tube inserted into the stomach for patients who are unable to take sufficient
    • food by mouth.
  19. Hemodialysis
    access maintenance
    • •Use
    • of angioplasty or thrombolysis to
    • open blocked grafts for hemodialysis,
    • which treats kidney failure.
  20. Needle biopsy
    • •Diagnostic
    • test for breast, lung and other cancers; an alternative to surgical biopsy.
  21. Radiofrequency (RF) ablation
    • •Use
    • of radiofrequency (RF) energy to cook and kill cancerous tumors.
  22. Stent
    • •A
    • small flexible tube made of plastic or wire mesh, used to treat a variety of
    • medical conditions (e.g., to hold open clogged blood vessels or other pathways
    • that have been narrowed or blocked by tumors or obstructions).
  23. Stent-graft
    • •Reinforces
    • a ruptured or ballooning section of an artery (an aneurysm) with a
    • fabric-wrapped stent C a small, flexible mesh tube used to "patch"
    • the blood vessel. Also known as an endograft.
  24. Thrombolysis
    • •Dissolves
    • blood clots by injecting clot-busting drugs at the site of the clot.
  25. TIPS (transjugular
    • •Dissolves
    • blood clots by injecting clot-busting drugs at the site of the clot.
  26. Uterine artery embolization
    • •An
    • embolization procedure of uterine arteries to stop life- threatening postpartum
    • bleeding, potentially preventing hysterectomy. The same procedure is used to
    • treat fibroid tumors and is then called UFE (Uterine Fibroid Embolization).
  27. Uterine fibroid embolization
    • •An
    • embolization procedure of uterine arteries to shrink painful, enlarged, benign
    • tumors in the uterus, also called UAE (Uterine Artery Embolization).
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RAD-285 CT
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