Position Spine Imaging Studies - ARRT Radiography Exam

1. What is the correct patient position for an AP open-mouth (odontoid) projection?

   Supine or erect, MSP centered; mouth opened wide. Centers the midsagittal plane and opens the mouth to project the dens through the oral cavity without overlap.

2. What CR angulation is used for posterior oblique cervical spine projections (RPO/LPO)?

   $15^ 0$–$20^ 0$ cephalad. Cephalad angulation aligns the beam with the foraminal plane in posterior oblique positions.

3. What is the correct patient position for an AP lumbar spine projection?

   Supine, knees flexed; MSP centered and perpendicular. Flexes knees to flatten lumbar curve and centers MSP to prevent distortion in the projection.

4. What is the correct patient position for an AP thoracic spine projection?

   Supine, knees flexed; MSP centered and perpendicular. Reduces lordosis and aligns the thoracic spine parallel to the image receptor for uniform density.

5. What is the CR centering point for an AP open-mouth (odontoid) projection?

   Center of open mouth. Directs the central ray through the dens and atlas via the open mouth for clear projection.

6. What is the CR centering point for an AP axial cervical spine (C3–C7) projection?

   C4 (level of thyroid cartilage). Centers the beam at the mid-cervical region to include C3-C7 vertebrae in the axial projection.

7. What is the correct patient position for a lateral thoracic spine projection?

   True lateral, arms raised; knees flexed for stability. Ensures perpendicular alignment of the thoracic spine and raises arms to avoid superimposition.

8. What is the CR centering point for a lateral thoracic spine projection?

   T7 (midcoronal plane, level of inferior scapular angle). Centers on the mid-thoracic region in the midcoronal plane for true lateral projection.

9. What is the correct patient position for an AP axial cervical spine (C3–C7) projection?

   Erect or supine, MSP centered; chin slightly elevated. Aligns the midsagittal plane with the image receptor and elevates the chin to open intervertebral disk spaces for clear visualization of C3-C7.

10. What is the correct patient position for a lateral lumbar spine projection?

    True lateral, knees flexed; arms forward; waist supported. Aligns the spine perpendicularly with support to minimize distortion and superimposition.

11. What is the patient position for a lateral cervical spine projection?

    Erect lateral, left side preferred; shoulders relaxed. Facilitates shoulder depression and minimizes magnification, with left side reducing heart shadow overlap.

12. What breathing instruction is used for a lateral cervical spine to improve shoulder depression?

    Suspend on full expiration. Maximizes shoulder depression to visualize the cervicothoracic junction clearly.

13. What is the CR centering point for an AP thoracic spine projection?

    T7 (midway between jugular notch and xiphoid). Targets the mid-thoracic spine to include all 12 vertebrae in the projection.

14. What breathing instruction is used for an AP thoracic spine projection to reduce lung markings?

    Suspend on full expiration. Minimizes lung volume to reduce overlying pulmonary markings and improve spinal visibility.

15. What central ray (CR) angulation is used for an AP axial cervical spine (C3–C7)?

    $15^ 0$–$20^ 0$ cephalad. Compensates for the cervical lordosis to project the central ray through the intervertebral disk spaces of C3-C7.

16. Which intervertebral foramina are demonstrated on RPO/LPO cervical spine obliques?

    Foramina farthest from the IR. Posterior oblique positioning demonstrates the contralateral foramina farthest from the image receptor.

17. What is the CR centering point for a lateral cervical spine projection?

    C4 (level of thyroid cartilage). Targets the mid-cervical spine to demonstrate all seven vertebrae without distortion.

18. What CR angulation is used for anterior oblique cervical spine projections (RAO/LAO)?

    $15^ 0$–$20^ 0$ caudad. Caudad angulation aligns the beam parallel to the intervertebral foramina in anterior oblique positions.

19. Which intervertebral foramina are demonstrated on RAO/LAO cervical spine obliques?

    Foramina closest to the IR. Anterior oblique positioning opens the ipsilateral foramina nearest the image receptor for demonstration.

20. What head rotation is required for a 45 0b0 anterior oblique cervical spine (RAO/LAO) projection?

    Rotate body $45^ 0$; head turned to face same direction as body. Positions the cervical spine at 45 degrees to elongate and visualize the intervertebral foramina.

21. What alignment is required on the AP open-mouth view to visualize dens and C1 clearly?

    Lower incisors and skull base aligned (no superimposition). Prevents superimposition of teeth or occiput over the dens and atlas for optimal odontoid visualization.

22. Which anatomical alignment is required for an AP axial cervical spine to avoid rotation?

    MSP perpendicular; shoulders in same plane. Ensures symmetrical positioning to prevent rotational distortion of the cervical vertebrae on the image.

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