Which two of the following positions can a patient be in for a plantodorsal axial calcaneus projection?

The plantodorsal axial calcaneus projection is an imaging technique used to visualize the heel bone (calcaneus) in a way that provides a clear view of its structure. For this projection, the patient's foot must be positioned correctly to effectively capture the anatomy of the calcaneus.

Being seated allows for adjustments in foot positioning to be more comfortable and aligned, while lying down also provides stability and allows for proper positioning of the foot without the risk of movement. This positions the calcaneus in a way that aligns it with the X-ray beam, thus ensuring optimal imaging.

In contrast, standing can introduce difficulties in maintaining the necessary foot position, and sitting or kneeling may not provide adequate access for the imaging technologist to obtain the desired view of the calcaneus. Therefore, the combination of seated and lying positions facilitates the required alignment and stability for a successful plantodorsal axial calcaneus projection, making this the correct choice.