Lumbar spine radiology: analysis of the posteroanterior projectionP C Brennan et al. Eur Radiol. 2000. Show
AbstractThe use of the posteroanterior (PA) technique as a means of dose reduction has been used effectively in radiology departments for chest and abdominal examinations. The aim of this investigation was to establish if the PA lumbar spine projection offers any advantages over the traditional anteroposterior (AP) view in terms of radiation dose and image quality. The contribution of tissue displacement to any dose reduction was also evaluated. The first part of the study involved the use of an anthropological phantom where entrance surface and an internal dose were measured for both the PA and AP projections. Entrance surface doses for both projections were then measured on randomly allocated female patients. Resultant image quality was assessed using CEC quality criteria. Anterior to posterior patient diameter was also recorded. The results demonstrated that with the PA compared with the AP projection, reductions of 38.6% (p = 0.016) and 38.9% (p = 0.02) in patient entrance surface dose and internal phantom dose, respectively. No significant differences in image quality were noted between the two projections. Patient diameter decreased by 1.8 cm with the PA view. The authors conclude that tissue displacement is the main factor for the patient dose reduction and recommend employment of the PA procedure for routine lumbar spine examinations. Similar articles
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Where is the CR directed for an AP lumbosacral spine?For an AP projection of the lumbar spine, the patient is supine on the table, with their hips and knees flexed to eliminate the normal physiologic lumbar lordosis. The CR is directed vertically to the center of the abdomen at the level of the iliac crests.
Where does the central ray enter for an anteroposterior AP projection of the cervical spine?The central ray enters at the level of T6 or T7. which of the following anatomic structures is best demonstrated ona right posterior oblique (RPO) cervical spine radiograph? What is the degree and direction of tube angulation for an anteroposterior (AP) axial projection of the sacrum?
What is the CR centering point for an AP oblique lumbar spine?centering point
PA erect. 2.5 cm above the iliac crests and 3 cm lateral from the spinous processes towards the upside.
Where is the AP lumbar spine?Lumbar Spine AP Oblique
The spine is centered to the midline of the grid. The lumbar spine is approximately 2 inches medial to the elevated anterior superior iliac spine in the oblique position. The arms are in a comfortable position. The patient should be asked to hold the breath during exposure.
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Where does the CR enter the patient for the AP projection of the lumbar spine?
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