RT 101 Unit Test 3 LGI

Why is the PA rather than the AP recommended for a small bowel series?

Better separation of loops of small intestine

The correct order of the segments of the colon, beginning with the cecum, is:

Ascending, hepatic flexure, transverse, splenic flexure, descending, sigmoid

What is another term for the AP axial projection taken during a barium enema procedure?

Butterfly position

Situation: A patient comes to radiology with a history of rectocele. Which of the following procedures best demonstrates this condition?

Evacuative proctogram

Which of the following conditions may lead to an adynamic ileus?

Peritonitis

Which aspect of the large intestine is located highest, or most superior, in the abdomen?

Left colic flexure

A properly positioned LAO for the large intestine will demonstrate the:

Left colic flexure and descending colon

Which imaging modality can demonstrate abscesses in the retroperitoneum?

MRI

Which laxative is classified as a saline type?

Magnesium citrate

When are small bowel series deemed to be complete?

Once the contrast media passes the ileocecal valve

Which specific aspect of the large intestine must be demonstrated during evacuative proctography?

anorectal angle

Central ray and image receptor centering for a 1-hour small bowel radiograph should be:

at the level of the iliac crest.

A telescoping, or invagination, of one part of the intestine into another is termed:

intussusception

How much CR angulation is required for the AP axial projection?

30 to 40 degrees

For an AP axial projection of the large intestine in the oblique position, the patient is placed in a:

30º to 40º LPO

Prior to having a small bowel series, the patient should remain NPO for:

8 hours

The recommended water temperature for a barium sulfate mixture used for most barium enema procedures is:

85 to 90 °F

Situation: During a single-contrast barium enema, the radiologist detects a possible defect within the right colic flexure. Which of the following projections and/or positions best demonstrates this region of the colon?

LPO

Situation: During fluoroscopy, the radiologist detects a possible polyp in the ascending colon. He asks the technologist to produce a radiograph that will best demonstrate this region of the large intestine. Which one of the following positions will accomplish this goal?

LPO

The three bands of longitudinal muscle that cause pouch-like appearance of the large intestine are termed:

Taenia coli

What is the term for the three bands of muscle that pull the large intestine into pouches?

Taenia coli

Why is it important for the technologist to review the patient's chart and inform the radiologist before beginning the BE exam if a biopsy was performed as part of a prior sigmoidoscopy or colonoscopy procedure?

The biopsy of the colon may weaken that portion of the colon, which could lead to a perforation during the BE exam.

Which of the following statements is not true in regard to a pediatric small bowel series?

The transit time for barium through the small intestine is longer than that of an adult.

Why is oral contrast media sometimes given during computed tomography colonography?

To mark or "tag" possible fecal matter

Which of the following pathologic conditions is best demonstrated with evacuative proctography?

rectal prolapse

The most distal portion of the colon is the:

sigmoid

Which part of the large intestine is located between the rectum and the descending colon?

sigmoid colon

At what stage of respiration should the enema tip be inserted into the rectum?

suspended expiration

During the initial enema tip insertion, the tip is aimed:

toward the umbilicus

Which part of the colon has the greatest amount of potential movement?

transverse colon

A single-stage, double-contrast barium enema involves instilling both the negative and positive contrast media at the same time.

true

CT is being performed to diagnose acute appendicitis.

true

Computed tomography colonography (CTC) is considered as an effective alternative to endoscopic colonoscopy.

true

For an average adult, the amount of barium ingested is two cups (16 oz) for a small bowel only series.

true

Meckel diverticulum is best diagnosed with a nuclear medicine scan.

true

Synthetic latex (latex-free) enema tips are safe to use for latex-sensitive patients.

true

The enteroclysis procedure is indicated for patients with regional enteritis.

true

Ultrasound, with graded compression, can be used in diagnosing acute appendicitis.

true

Which modality is used for the diagnosis of acute appendicitis?

ultrasound

The "tapered," or "corkscrew," radiographic sign is often seen with:

volvulus

What type of enema tip is recommended for a barium enema on an infant?

10 Fr, flexible silicone catheter

The average time to scan the large intestine during a computed tomography colonography is:

10 min

The average length of time (in hours) it takes barium sulfate to reach the ileocecal valve after entering the stomach is:

2 to 3

The types of digestive movement characteristic of the large intestine include: 1.) Rhythmic Segmentation 2.) Haustral Churning 3.) Mass Peristalsis 4.) Defecation

2, 3 and 4 only

Regional enteritis is: 1.)Also known as ileus 2.) Characterized by the string sign 3.) Chronic and inflammatory

2, 3 only

The approximate uncoiled length (in feet) of the small intestine is:

20-23 feet

Situation: While attempting to insert an enema tip into the rectum, the technologist experiences resistance. What should be the next step taken by the technologist?

Have the radiologist insert it using fluoroscopic guidance.

Which of the following conditions may produce the "cobblestone" or "string" sign?

Regional enteritis (Crohn's disease)

Which part of the large intestine has the widest diameter?

cecum

The "stovepipe" radiographic sign is often seen with:

chronic ulcerative colitis.

The shortest segment of the small intestine is the:

duodenum

During a colostomy barium enema, a double-contrast retention enema tip is used.

false

Rectal retention enema tips should be fully inflated by the technologist before beginning a barium enema.

false

Which part of the GI tract synthesizes and absorbs vitamins B and K?

large intestine

Which of the following barium enema projections and/or positions provides the greatest amount of gonadal dosage to both male and female patients?

lateral rectum

Which of the following conditions would contraindicate the use of a cathartic before a barium enema?

obstruction