What is the proper CR angulation for an AP projection of the cervical vertebrae?

Comparative Study

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Cervical spine: comparison of 45 degrees and 55 degrees anteroposterior oblique radiographic projections
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What is the angle for the AP cervical spine projection?
What type of CR angle is required for the AP oblique position of the cervical spine?
What is the proper Cr angle and direction for the AP oblique projections of the cervical spine?
How many degrees and in which direction should the C arm be tilted for the PA projection of the C spine during an Acdf procedure?

Cervical spine: comparison of 45 degrees and 55 degrees anteroposterior oblique radiographic projections

S Marcelis et al. Radiology. 1993 Jul.

Abstract

The orientation of the intervertebral foramina (IVF) at six cervical levels on transaxial images in 65 magnetic resonance (MR) studies was determined to explain variations in size and shape evident on the 45 degrees standard radiographic oblique view. Analysis of MR imaging data showed that substantial variations in the orientation of the cervical IVFs occurred throughout the cervical spine and that a 55 degrees anteroposterior (AP) oblique view with standard radiography probably would lead to better visualization of the lower cervical IVFs. These results were confirmed with a radiographic and anatomic study of two cadaveric specimens. In a prospective clinical study of 23 patients, 45 degrees and 55 degrees AP oblique views were compared by measuring the maximal transverse diameter of all the cervical IVFs. IVF size was substantially increased on the 55 degrees AP oblique projection at all lower cervical levels. The 55 degrees AP oblique view of the cervical spine is optimal for evaluating the lower cervical foramina and can be a routine alternative to the 45 degrees oblique view in the analysis of all cervical foramina.

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What is the angle for the AP cervical spine projection?

B: For the AP view of the cervical spine, the patient is either erect or recumbent. The beam is directed toward the C-4 vertebra (at the Adam's apple) at an angle of 15°-20° cephalad.

What type of CR angle is required for the AP oblique position of the cervical spine?

An RPO position of the cervical spine requires a 45° oblique of the body with a 15° caudad CR angle. Another term for a breathing technique during exposure is the orthostatic technique. The anterior oblique thoracic spine demonstrates the upside zygapophyseal joints.