Tuesday, December 6, 2011

Dorsal Decubitus Position : Abdominal Xray

Dorsal Decubitus Abdomen is a radiographic examination of the abdomen with patient in supine position. Central Ray is horizontal and  can be taken in either the patient position rotated to right or left in Lateral Position (Right or Left). Pathology such as Abnormal masses, accumulations of gas, air-fluid levels, aneurysms (a widening or dilatation of the wall of an artery, vein, or the heart), calcification of aorta or other vessels, and umbilical hernias may demonstrate if present.

Abdominal xray lateral
Left Dorsal Decubitus Position

Technical Factor and Shielding:

IR size - 35 x 43 cm (14 x 17 inches), crosswise
Moving or stationary grid
70 to 80 kV range
Use gonadal shields on males.

Patient Position:

Supine on radiolucent pad, side against table or vertical grid device; secure cart so that it does not move away from table or grid device.
Pillow under head, arms up beside head; support under partially flexed knees may be more comfortable for the patient.

Part Position and Central Ray:

Adjust patient and cart so that center of IR and CR is 2 inches (5cm) above level of iliac crest (to include diaphragm).
Ensure that no rotation of pelvis or shoulders exist (both ASIS should be the same distance from tabletop).
Adjust height of IR to align midcoronal plane with centerline of IR.
CR horizontal to center of IR 2inches (5cm) above iliac crest and to midcoronal plane
Minimum SID of 40 inches (100cm)

Collimation and Respiration:

Collimate to upper and lower abdomen soft tissue borders.
Close collimation is important because of increased scatter from higher kV and need for soft tissue visibility.
Expose is made at end of expiration.

Note: This may be taken as a right or left lateral; appropriate R or L lateral maker should be used, indicating which side is closest to IR.

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