What surface of the hand should be in contact with the IR for a posteroanterior (PA) projection?

For a posteroanterior (PA) projection of the hand, the anterior (palmar) surface should be placed in contact with the imaging receptor (IR). This positioning allows the x-rays to enter through the posterior side of the hand and exit through the anterior surface. It ensures a clear and accurate representation of the anatomy in the images produced, capturing the bones and soft tissue as they naturally appear.

Positioning the hand this way minimizes distortion and provides a true representation of the anatomical structures. The PA projection is commonly used in radiographic imaging of the hand to assess conditions such as fractures, arthritis, and other abnormalities. Proper contact with the IR also ensures optimal image quality with appropriate detail and resolution.