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RAD125 L Spine
Lumbar, Sacrum and Coccyx Anatomy Handout
Question | Answer |
---|---|
Which 2 projections will demonstrate the right sacroiliac joint? | AP Oblique, LPO position PA Oblique, RAO position |
Which of the following is the essential projection used to demonstrate the zygapophyseal joints of the lumbar spine? | AP Oblique |
Where is the central ray positioned for a lateral coccyx? | 3.5 inches posterior to ASIS and 2 inches inferior |
Where is the central ray positioned for a lateral sacrum? | At the level of the ASIS and 3.5 inches posterior |
The respiration phase for the AP oblique projection of the lumbar spine is: | Expiration |
The intervertebral foramina of the superior four lumbar vertebrae are situated how many degrees from the midsagittal plane? | 90 |
All of the following might be used to provide an optimal image on a lateral projection of the lumbar spine, except: sponge to support spine in horizontal position 72" SID close collimation lead rubber sheet | 72" SID |
Which plane is placed perpendicular to the tabletop and centered to the midline of the grid for a lateral lumbar spine? | midcoronal plane |
the central ray angle for a lateral coccyx and sacrum is: | 0 degrees |
If the lumbar spine cannot be adjusted so it is horizontal for the lateral projection, the central ray should be angled: | 5 degrees men, 8 degrees women, caudad |
When only the lumbar vertebrae (not lumbosacral) are imaged in the AP projection, the central ray is directed how many inches above the iliac crests? | 1.5 |
Occasionally, a patient may have to be placed in the prone position for sacrum radiography, and a PA projection performed. What is the central ray angle for this projection? | 15 degrees caudad |
What is the central ray angle for the AP axial projection (Ferguson method_ of the lumbosacral junction? | 30 to 35 degrees cephalad |
What is the central ray centering point for an AP oblique lumbar spine? | 2 inches medial to the elevated ASIS and 1 to 1.5 inches above the iliac crest |
The condition of the lumbar spine in which there is anterior displacement of one vertebra over another is termed: | spondylolisthesis |
How many degrees is the body rotated for the AP projection of the sacroiliac joint? | 25 to 30 |
Which zygapophyseal joints are demonstrated on the AP oblique projection of the lumbar spine? | Joints closest to the IR |
on each side of the Sacral base is a large wing-like mass called the: | ala |
The central ray angle for an AP axial projection of the coccyx is: | 10 degrees caudad |
Where is the central ray directed for an AP lumbosacral spine? | Iliac crests |
How many vertebrae are there in the sacrum? | 5 |
The central ray angle for an AP axial projection of the sacrum is: | 15 degrees cephalad |
Where does the central ray enter the patient for an AP axial projection of the sacrum? | 2 inches superior to the pubic symphysis |
which projection of the lumbar spine displays the vertebrae in the form of a "Scottie dog"? 1. Lateral 2. AP Oblique 3. PA Oblique | 2 and 3 |
To demonstrate the zygapophyseal joints of the lumbar spine, MSP of the patient is rotated how many degrees? | 45 |
An alternate method of positioning the central ray for the L5-S1 lateral projection is: | parallel with the interiliac line. |