SINGLE PHOTON ABSORPTIOMETRIES Meaning and
Definition
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Single Photon Absorptiometry (SPA) is a medical imaging technique used for the measurement of bone mineral density (BMD). It is based on the principle of photon absorption by matter, where a single X-ray photon is used to measure the density of bone tissue.
In SPA, a collimated beam of X-rays with a known energy level is directed towards the bone being examined. As the X-ray beam passes through the bone, some photons are absorbed by the bone tissue while others pass through. The absorbed photons are then detected by a scintillation crystal, which converts the X-ray energy into light pulses. These light pulses are then converted into electrical signals by a photomultiplier tube.
The number of photons absorbed by the bone is proportional to its density, allowing for the calculation of bone mineral density. SPA is particularly useful in assessing skeletal health, as it is a non-invasive method that provides information about the bone strength and risk of fractures.
SPA is commonly used for bone density measurements in the forearm, heel, and finger. It is especially beneficial in routine screenings for osteoporosis, as it is quick, cost-effective, and exposes the patient to a low amount of radiation. It provides accurate and reliable results, making it a valuable tool in the diagnosis and monitoring of bone-related conditions.
Common Misspellings for SINGLE PHOTON ABSORPTIOMETRIES
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