Doctor insights on:
How Does A Dexa Scan Work
Sending two waves: The dxa (stands for dual-energy x-ray absorptiometry) machine sends beams of low-radiation x-rays with "two" distinct energy waves (hence the name dual) through the bones being scanned. One wave is absorbed mainly by soft tissue and the other by bone. The soft tissue amount can be subtracted from the total and what remains is a patient's bone mineral density. Hope this helps ! ...Read moreSee 1 more doctor answer
Different methods: Qct is quantitative computerized tomography. It uses calibration to measure bone density with a ct. It is very accurate, but does expose you to a fair dose of radiation, limited the number of times it should be done over the course of life. Dexa is dual energy x-ray absorptiometry is like a low dose x-ray. It too gives bone density, but since the radiation dose is lower, it can safely be repeated. ...Read more
Low: Z score compares your bone density to the average of your age group. If it is a positive number, you have above average bone density. If negative, below. The actual number represents the "standard deviations" from the mean, how far away from average you are. For -2.6, it means that you are approximately in the lower 3% for bone density for your age. That is, 97% have higher bone density than u ...Read moreSee 1 more doctor answer
I am having a tac scan for my severeosteoporosis what will it show, that is not shown on a DEXA scan, what is the difference?
Osteomalacia: No. A Dexa detects osteoporosis, or decreased amount of bone matrix. Osteomalacia is an abnormal type of bone, soft bones, abnormal building process. You can have both osteoporosis/malacia, so dexa is still done in the workup to measure the amount of bone. Vit D deficiency, GI disorders that cause malabsorption, kidney disease, liver disease, certain drugs... all are part of the differential. ...Read moreSee 1 more doctor answer