Final answer:
DEXA is a true and accurate way to measure bone density. It utilizes two low-dose X-ray beams to assess bone, muscle, and fat tissues. Mammograms aid in breast cancer detection but need confirmation through additional methods, such as MRI, for a definitive diagnosis.
Step-by-step explanation:
Dual-energy X-ray absorptiometry (DEXA) is indeed an accurate method for evaluating bone density. It functions by sending two low-dose X-ray beams through the body and measuring the amount of energy absorbed by the bones, lean tissue mass, and fat mass. The differences in energy absorption are used to estimate the bone mineral density, which provides an indication of bone strength and the potential risk for fractures or osteoporosis. DEXA scans can also determine body fat content using a similar principle, making it a versatile tool in assessing overall body composition. Therefore, the statement that DEXA is an accurate way to evaluate bone density is True.
Mammograms are crucial in the early detection of breast cancer, as they can reveal areas of increased density within the breast which may indicate the presence of a lump. However, they cannot confirm whether the lump is malignant. For improved diagnostic accuracy, especially in dense breast tissues, MRI (Magnetic resonance imaging) can be used as a supplemental technique to x-rays, reducing the likelihood of false-positive results. Understanding the limitation of mammograms is key to advancing medical diagnosis and treatment options for breast cancer.
Lastly, calcium is a vital mineral found in bones, but it is not the only one. Bones are made up of a matrix that includes other minerals such as phosphorus, magnesium, and fluoride, as well as organic components like collagen. Therefore, the statement that calcium is the only mineral in bones is False.