Radiography is defined as

Radiography is defined as

• A. Making of records known as radiographs of internal structures of the body by passage of x-rays or gamma rays
• B. Using radioactive isotopes to treat cancer
• C. Recording electrical activity of the heart
• D. Measuring bone density with ultrasound

Answer: (A)

Radiography is an imaging method that uses high-energy photons—x-rays (and, in some contexts, gamma rays)—to pass through the body and capture an image based on how different tissues absorb or transmit those photons. Bones absorb more and appear white or bright, while softer tissues let more photons pass and appear darker or gray. This imaging approach is about forming pictures of internal structures, not about treatment or other diagnostic techniques. For example, using radioactive isotopes to treat cancer, recording the heart’s electrical activity, or measuring bone density with ultrasound do not produce images in the same way radiography does, since they rely on different principles or technologies.

Radiography is an imaging method that uses high-energy photons—x-rays (and, in some contexts, gamma rays)—to pass through the body and capture an image based on how different tissues absorb or transmit those photons. Bones absorb more and appear white or bright, while softer tissues let more photons pass and appear darker or gray. This imaging approach is about forming pictures of internal structures, not about treatment or other diagnostic techniques. For example, using radioactive isotopes to treat cancer, recording the heart’s electrical activity, or measuring bone density with ultrasound do not produce images in the same way radiography does, since they rely on different principles or technologies.