Which of the following reasons might a barium contrast study be performed? Choose all that are correct.

Myelography 

What radiographic view is this positioning used for?

What anatomical structure is highlighted by barium in this radiograph?  

Explain why foam wedges are needed for lateral thoracic and spinal radiographs. 

What radiographic view is this positioning used for?  

The borders for lateral and VD views of the thoracic vertebrae are Cranial: [C7] ​ Caudal: [L1]

The borders for a VD extended leg radiographic view are Cranially [tipofiliacwing] Caudally [distalpatella] 

Fill in the blanks to correctly describe the borders for a lateral thorax radiograph:  Cranial: Palpate from the cranial point of the scapulohumeral articulation, include [thoracicinlet] Caudal: A few centimeters caudal to the [lastrib]

In limb (orthopedics) radiographs it is important to position the bone [parallel] to the image receptor and the central ray [perpendicular] to the bone.