Abstract: The present disclosure provides a bi-directional image receptor assembly capable of receiving an image receptor in either a lengthways (or longitudinal) or crossways (or transverse) orientation, while maintaining the axis of an anti-scatter grid in a fixed position. The axis of the anti-scatter grid can be placed in a fixed orientation (such as a parallel orientation) to a subject's craniocaudal axis regardless of whether the image receptor is inserted in the lengthways or crossways orientation. Methods of using the bi-directional image receptor assembly in mobile radiography are also disclosed. The present disclosure further provides for an X-ray image receptor comprising a portion of an automatic position measurement system. Still further, the present disclosure provides for a cover comprising a reinforcing geometry that maximizes the strength of the cover while minimizing the thickness of the cover.