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Ch 12, 26, 31
Rad III 12,26,31
Question | Answer |
---|---|
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 |