Abdomen (oblique view)
AP oblique supine radiograph is normally performed when localising foreign bodies or lines within the abdominal cavity. Additionally, the oblique abdominal series can be utilized in the assessment of the upper intestinal tract during barium studies.
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Patient position
- the patient is laying 30 degrees either LAO or RAO, often on a 30-degree wedge to ease of positioning
- patients should be changed into a hospital gown, with radiopaque items (e.g. belts, zippers) removed
- the x-ray is taken in full inspiration
Technical factors
- AP oblique projection
-
centring point
- the midsagittal place (equidistant from each ASIS) at the level of the iliac crest
-
collimation
- laterally to the lateral abdominal wall
- superior to the diaphragm
- inferior to the inferior pubic rami
-
orientation
- portrait
-
detector size
- 35 cm x 43 cm
-
exposure
- 70-80 kVp
- 30-120 mAs; AEC should be used if available
-
SID
- 100 cm
-
grid
- yes
Image technical evaluation
- lateral abdominal wall should be included
- inferior pubic rami should be included inferiorly
- if possible, the diaphragm should be included superiorly
- adequate rotation can be confirmed via the presence of the 'Scotty dog' sign of the lumbar spine
- no blurring of the bowel gas due to respiratory motion
Practical points
For larger patients, it may be necessary to perform two x-rays using a landscape orientation of the detector to include the entire abdomen.
Exposure will need to be adjusted according to the imaging system (CR or DR) and patient size. Where possible mAs should be manipulated to ensure adequate image density and appropriate image contrast.
Related Radiopaedia articles
Radiographic views
- radiographic positioning and terminology
- systematic radiographic technical evaluation
- chest radiography
- pediatric chest radiography
- abdominal radiography
- pediatric abdominal radiography
-
upper limb radiography
-
shoulder girdle radiography
- scapula series
-
shoulder series
- AP view
- internal rotation view
- external rotation view
- superoinferior axial view
- inferosuperior axial view
- modified trauma axial
- supine lateral
- modified supine lateral
- Y lateral view
- AP glenoid view
- apical oblique view (Garth view)
- humerus (neck) AP view
- humerus axial (bicipital groove) view (Fisk view)
- outlet view (Neer view)
- Stryker notch view
- acromioclavicular joint series
- clavicle series
- sternoclavicular joint series
- arm and forearm radiography
- wrist and hand radiography
-
shoulder girdle radiography
-
lower limb radiography
- pelvic girdle radiography
- thigh and leg radiography
- ankle and foot radiography
- skull radiography
-
paranasal sinus and facial bone radiography
- facial bones
- Caldwell view (angled skull PA view)
- nasal bones
- zygomatic arches
- orbits
- paranasal sinuses
- temporal bones
-
dental radiography
- orthopantomography (OPG)
- mandible
- temporomandibular joints
- spine radiography