Bone Densitometry   Bone Densitometry, also called DEXA Scan, uses x-rays to measure bone density and size. This allows physicians to evaluate any weakening of the bones, also known as Osteoporosis. Preparing for Your Bone Densitometry Examination. No preparation is required for this examination. Your physician's office may schedule your appointment Monday - Friday at Maplewood Imaging Center. What is Osteoporosis? Click here! Screening for Osteoporosis with Heel Ultrasound is now available at Central Triad Imaging Center. Lunar Achilles Express Ultrasonometer uses Ultrasound of the heel to measure bone density for evaluation of the risk of osteoporosis.