Indications for imaging
Congenital abnormalities, trauma, pain, spondylolisthesis, metastasis's.
|
|
Anatomy Demonstrated
Lumbar vertebra, especially the pedicles and articular
processes.
Lumbar Spine Rt Posterior oblique Anatomy
Meschan, I. 1955 An Atlas of Normal Radiographic Anatomy
Saunders, London
|
|
Basic Patient Position
From the supine position the patient is rotated 45 degrees
with the side to be imaged raised, and supported on pads, with
the hips and knees slightly flexed to aid stability.
Lumbar Spine Posterior oblique Patient Position
Meschan, I. 1955 An Atlas of Normal Radiographic Anatomy
Saunders, London
|
Radiation protection
There are many local rules for gonad protection however the
following should be taken into account. The 28 day rule should
be applied for female patients.
In males direct lead rubber gonad protection can be applied at
all times, in females positioning rules will determine
protection in females.
|
Central Ray
The vertical central ray is centered to a point midway
between the lower costal margin and the iliac crest on the
raised side in the mid clavicular line approximately 4 cm medial
to the iliac crest of the raised side.
Exposure is made on suspended expiration.
|
Exposure Factors
| Kv |
mAS |
FFD (cm) |
Grid |
Focus |
AEC |
Cassette |
| 80 |
50 |
100 |
Yes |
Broad |
Yes |
24 x 30 cm |
|
Evaluation of the Image
ID and markers must be present and correct in the appropriate
area of the film
Evidence of collimation on four sides equally around the
centering point.
Optimal exposure should penetrate all the bone structures and
contrast should be low enough to visualise fully the bone and
soft tissue structures.
Limits of the examination, superiorly T12, inferiorly the first
sacral segment laterally the dorsal skin surface medially the
anterior borders of the lumbar vertebral bodies.
The superior and inferior articular joints should be open, the
pedicles should be clearly visible.
Lumbar Spine Rt Posterior oblique Radiograph and outline
|
Related Projections
Lumbar spine Lateral
Lumbar spine AP
|
Additional modalities
CT
MRI |
|
No comments:
Post a Comment