American Registry of Radiologic Technologists (ARRT) Practice Exam

Bone is the type of tissue that absorbs the largest amount of diagnostic x-ray due to its high density and mineral content, primarily calcium. When x-rays pass through the body, denser tissues like bone impede the passage of x-rays more effectively than less dense tissues. This absorption creates a contrast on radiographic images, allowing for better visualization of skeletal structures.

In diagnostic imaging, the principle of differential absorption is crucial. Dense structures like bones absorb more radiation, appearing lighter on the resulting image, while less dense tissues such as fat and muscle allow more x-rays to pass through, resulting in a darker appearance. This characteristic makes bone significant in diagnostic radiology, as it aids in identifying fractures, abnormalities, and various conditions affecting the skeletal system.

Therefore, bone's density and composition are the key reasons it absorbs the largest amount of diagnostic x-ray compared to other types of tissues.