Large Intestine Quiz

What is the length of the large intestine?

5 feet

How many layers compose the wall of the colon?

Four

What is the vermiform appendix attached to?

The cecum

What is the opening between the small and large intestine?

Ileocecal valve

What is the primary importance of preparing the intestinal tract for the exam of the colon?

• Fecal matter can simulate pathology so we need that cleaned out

• We don’t want to get feces all over us

Who inflates the retention balloon?

The radiologist using fluoro

What position should your patient be in to insert the enema tip?

Sims

How far above the anus should the enema bag be placed?

18 to 24 inches

What is the most used centering point or level of the patient?

Iliac crest

What is the respiration phase for all images of the large intestine?

Suspend respiration

All of the projections taken during barium enemas will demonstrate the rectosigmoid area except for:

Left lateral decubitus

Central ray angle for a PA axial of the large intestine?

30 to 40 degrees

The degree of body rotation for the RAO and LAO

35 to 45 degrees

At which plane is the central ray position for the PA oblique projection LAO and RAO of the large intestine?

• 1 to 2 inches lateral of a longitudinal plane

• 1 to 2 inches lateral towards the elevated side

Between the RAO, LAO, PA Axial, and AP axial, which one best demonstrates the right colic flexible?

RAO

Which projection would best demonstrate the ascending colon?

RAO

What is clearly demonstrated on an LAO position?

Left colic flexure and descending colon

What level is the center of the IR positioned for a lateral projection of the rectosigmoid area?

ASIS

For a lateral projection of the large intestine, what plane is center to the IR of the grid?

Midcoronal

Central ray angle for an AP axial

30 to 40 degrees cephalad

Where is the IR centered for all the deepest projections?

Level of iliac crest

General term thats used to describe a surgical procedure forming an artificial opening to the intestine for passage of fecal material

Enterostomy

Examples of radiolucent material

• Air

• Carbon dioxide

Examples of radiopaque material

• barium

• Iodinated contrast media

If your patient is suspected of having a perforation or leak, what kind of media would be used?

Water soluble iodinated contrast

How far should the enema tip be placed into the rectum?

No more than 4 inches