Air Contrast (Double) BE

Quick technique

kVp

90–100

mAs

15–25

SID

40 in

Grid

Yes

Detector

35x43 cm.

Breath

Suspend on expiration.

Views

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Patient position

Begin prone; multiple rotations to coat then air-distend.

Part position

Barium first, then drained; air insufflated for double contrast.

Central ray

Iliac crest; PA axial sigmoid 30–40° caudal to ASIS.

IR placement

35x43 cm.

TechniqueDefault

kVp

90–100

mAs

15–25

SID

40 in

Grid

Yes

Breath

Suspend on expiration.

Detector

35x43 cm.

Custom values save locally on this device. Cloud sync & department sharing coming soon.

Anatomy coverage

Entire colon with mucosal detail.

Tech pearls

Double contrast is superior for polyp detection.
Right lat decub: air rises to ascending colon.

Image evaluation

Mucosal pattern crisply demonstrated
Both decubitus images show air-fluid levels

Common mistakes

Insufficient air → poor mucosal detail
Decubitus done without horizontal beam

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Anatomy overview

Mucosal surface of entire colon

Protocol controls

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