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Ch 12, 26, 31

Rad III 12,26,31

What is arthrography? An exam when contrast is introduced into a joint space and x-rays are taken
What kinds of contrast can be injected into a joint space? certain iodine contrasts, air
What are the main joints that are examined during arthrography? hip, shoulder, knee, wrist, TMJ
What modality is used instead of arthrography when possible? MRI
How is CT better to differentiate between soft tissues than a regular radiograph? CT has much better contrast resolution than x-ray
WHat are the 3 major imaging planes in CT? Axial, sagittal, coronal
Which plane divides the body into upper and lower portions? axial or transverse
Which plane divides the body into rt and lt portions? sagittal
Which plane divides the body into anterior and posterior portions? coronal
Be familiar with CT image at level F head know mastoid air cells
Be familiar with CT image at level E head know where the optic nerve is, and cribiform plate
Be familiar with CT image at level G head know where the maxillary sinuses are, and vomer
Be familiar with CT image thru pulmonary trunk, slide 38 know where the ascending aorta and descending aorta are
Be familiar with CT image at level E abdomen know where the liver and gallbladder are
Be familiar with CT image at level F abdomen know where the spine and kidneys are The spine is not labeled but is large round density in between both kidneys
Be familiar with how to explain the slice ex. axial plane of the brain; sagittal plane of the lower abdomen; coronal plane of the brain
What is the process of creating a cross-sectional tomographic plane of any part of the body CT
What are the 2 things CT is better at than regular radiographs? CT eliminates superimposition of tissues or organs, CT has improves contrast resolution
What was the 2nd generation of CT categorized as? Fan shaped beam
What was the 4th generation of CT categorized as? Rotate only!
What is a grid of rows and columns termed? matrix
What is a single square, or picture element within a matrix termed? pixel
The product of pixel area and and slice thickness is known as? voxel
What is the reference material in the body CT uses for imaging? water
What are the 3 major components of the CT unit? table, gantry, computer/operators console
Window levels should be set to what number? CT number of the tissue of interest each tissue density had a different #
What does a narrow width do to an image? Has high contrast or fewer shades of gray
What does a wide width do to an image? Has a longer scale of contrast or more shades of gray
What does MRP stand for? multiplanar reconstruction
Why is MPR so important for CT imaging? It can reconstruct an image into different planes! Such as axial to coronal without added radiation
How is oral contrast different in CT compared to x-ray? It must be less concentrated
What are the 4 main quality factors in CT? noise, artifacts, spatial resolution, contrast resolution
What occurs in a Spiral/Helical CT? The gantry rotates continuously around the patient while the table moves through the gantry
What is another name for the 64 slice scanner in CT? Multislice spiral/helical CT
What is the main way to report dosage in CT? DLP or Dose Length Product
What are some cons for having an MRI? costly, if the pt has metal implants or anything metallic in their body, claustrophobic
What are some of the cons for having a CT? CT does not demonstrate soft tissues as well as MRI, possible allergic reaction to the contrast, has a radiation dose where MRI does not
Created by: radgirl37