What means obstructing passage of xrays?

Answer 1

Obstructing the passage of X-rays refers to the ability of certain materials or tissues to block or absorb X-ray radiation, preventing it from reaching the detector or film. This property is utilized in medical imaging, where denser materials like bones appear white on X-ray films due to their higher absorption of X-rays compared to softer tissues. Conversely, materials that allow X-rays to pass through easily, such as air or fat, appear darker on the imaging. This differential absorption helps in diagnosing various medical conditions.