Perform Abdominal GI Procedures - ARRT Radiography Exam

Which projection best demonstrates the esophagus between the heart and vertebral column with minimal superimposition?

RAO esophagus. RAO obliquity projects the esophagus away from the heart and spine, reducing overlap for better detail.
What is the preferred side down for an abdominal decubitus to detect pneumoperitoneum, and why?

Left side down; free air rises over the liver. Placing the left side down positions the liver on the higher right side, enabling free air to rise and become visible over it for pneumoperitoneum detection.
Which oblique esophagus position is preferred for patients who cannot tolerate RAO due to trauma or pain?

LPO esophagus. LPO serves as an alternative obliquity that still minimizes superimposition for patients unable to assume RAO.
Which enema contrast technique uses barium plus air to maximize mucosal detail?

Double-contrast barium enema. Introducing air after barium coating creates double contrast, highlighting mucosal patterns and polyps effectively.
What is the standard patient preparation goal before a barium enema examination?

Clean, empty colon (bowel cleansing and fasting). A cleansed colon ensures unobstructed barium flow and clear visualization of mucosal details without fecal interference.
Which position best demonstrates the duodenal bulb and C-loop in an upper GI series?

RAO. RAO obliquity separates the duodenal bulb and C-loop from gastric superimposition, providing a clear profile.
Which position best demonstrates the left colic (splenic) flexure and descending colon in a barium enema?

LAO. LAO obliquity profiles the left colic flexure and descending colon, reducing superimposition for detailed imaging.
Which abdominal position best demonstrates air-fluid levels in the bowel?

Upright abdomen (or decubitus with horizontal beam). Upright or horizontal beam positioning utilizes gravity to separate air and fluid, clearly delineating levels in the bowel loops.
Which position best demonstrates the right colic (hepatic) flexure and ascending colon in a barium enema?

RAO. RAO obliquity opens the right colic flexure and ascending colon, minimizing overlap with other bowel segments.
What is the CR level for an upright AP abdomen to include the diaphragm for free air evaluation?

Approximately $2$ in ( $5$ cm) above iliac crests. Higher centering compensates for the elevated diaphragm in upright position to capture potential free air under it.
Which abdominal projection best demonstrates free intraperitoneal air when the patient cannot stand?

Left lateral decubitus abdomen (horizontal beam). This position allows free intraperitoneal air to rise and accumulate under the right hemidiaphragm, making it visible without patient standing.
Which abdominal projection is best for demonstrating the aortic aneurysm calcification profile?

Lateral abdomen. Lateral view provides a profile of the abdominal aorta, allowing assessment of aneurysm calcifications in the sagittal plane.
Identify the correct position to show the rectosigmoid region elongated and free of superimposition in a barium enema.

AP axial (Taylor method). AP axial angulation elongates the rectosigmoid junction, separating it from sacral superimposition in barium studies.
Which projection best demonstrates the kidneys, ureters, and bladder with minimal superimposition?

AP abdomen (KUB). The AP projection aligns the kidneys, ureters, and bladder for clear visualization with reduced overlapping structures.
What is the CR level for a lateral abdomen in the midcoronal plane?

Iliac crests (L4-L5). Centering at this level captures the mid-abdomen, including retroperitoneal structures, in the lateral projection.
Which position best demonstrates the gastric fundus filled with air during a double-contrast upper GI?

RAO. RAO elevates the fundus, enabling air to fill it while barium coats lower structures in double-contrast studies.
What is the minimum patient upright time before an upright abdomen to demonstrate free intraperitoneal air?

At least $5$ minutes upright. This duration allows sufficient time for free air to migrate superiorly under the diaphragm for optimal visualization.
What breathing instruction is used for most abdominal radiographs to reduce motion?

Suspend respiration after expiration. Expiratory suspension minimizes diaphragmatic motion and bowel gas movement, improving image sharpness.
Which projection best demonstrates the kidneys parallel to the IR and shows the psoas muscles well?

AP oblique abdomen (RPO and LPO). Oblique positioning rotates the kidneys parallel to the image receptor, enhancing visibility of renal outlines and psoas shadows.
What is the central ray (CR) level for a supine AP abdomen (KUB)?

Iliac crests (L4-L5). Centering at the iliac crests ensures inclusion of the kidneys, ureters, bladder, and lower abdomen in the supine AP projection.
Which position best demonstrates the gastric fundus filled with barium during an upper GI series?

LPO. LPO makes the fundus dependent, allowing barium to pool there for optimal filling and visualization.
Which barium sulfate preparation is typically used for an upper GI series: thin or thick?

Thick barium (for mucosal coating). Thick barium provides better adherence to mucosal surfaces, enhancing detail in upper GI imaging.
Which contrast agent is preferred when gastrointestinal perforation is suspected?

Water-soluble iodinated contrast. Water-soluble contrast is safer as it does not cause peritonitis if it leaks into the peritoneal cavity through a perforation.
Which GI contrast study is contraindicated in suspected large-bowel obstruction due to perforation risk?

Barium enema (use water-soluble instead). Barium can exacerbate obstruction or cause severe complications if perforation occurs, necessitating water-soluble alternatives.
What is the typical obliquity range for AP oblique abdomen (RPO/LPO)?

$30^{\circ}$ to $45^{\circ}$ oblique. This degree range rotates the body sufficiently to profile the kidneys and ureters without excessive distortion.

Study these flashcards