Bone densitometer is the determination of human bone mineral and obtain the relevant data of the medical testing equipment, bone densitometer test results data to T-value-based, but also includes Z-value, bone mineral density, bone volume and other data, bone densitometer to dual-energy X-ray way to test the results of the more accurate, is the International Health Organization (WHO) to adopt the gold standard of bone mineral density, the early 21st century, the mainstream of the market is divided into the dual-energy bone densitometer and ultrasound bone densitometer two categories. The mainstream bone densitometers in the market at the beginning of 21st century are divided into two categories: dual-energy X-ray bone densitometer and ultrasonic bone densitometer, and there are also single-photon bone densitometers although X-ray bone densitometers but not dual-energy technology. Here we mainly introduce the two major categories of bone densitometer on the market.
QCT bone densitometer basic knowledge overview
1. What is QCT? CT machine for quantitative examination of bone mineral content (BMC) is called quantitative CT (quantitative computed tomography) that is, QCT bone densitometer system.
2. QCT bone densitometer system components and its structure (1) measurement body mold Polyethylene (PE) and a small amount of MgO and CaCO3 reagent, through the plastic machinery processing, made of human soft tissue and radiation equivalent plastic. The equivalent plastic and calcium hydroxyphosphate are then processed by plastic machinery to make a bone equivalent material that is equivalent to the radiation of human bone tissue. With this bone equivalent material made of calcium hydroxyphosphate containing 50 mg/cm3, 100 mg/cm3 and 200 mg/cm3 three different densities of equivalent bone specimens, each specimen shape is Φ20 × 290, they will be embedded in the length 290 × width 148 × thickness of 34 equivalent plastic parts, equivalent plastic parts can be seen as a calcium hydroxyphosphate containing 0 mg/cm3 density of the bone specimens.In this way a linear solid reference body mold of an equivalent bone specimen containing four different Ca5OH(PO4)3 density values is made. This is the QCT Bone Densitometer System measurement body mold used to test a patient's vertebral bone density.
(2) Quality assurance body mold This body mold is still made of the equivalent plastic and equivalent bone material described above, and its external shape and dimensions simulate a truncated section of the lumbar region of the torso, with a thickness of 40. Equivalent bone is a Φ32×40 cylinder containing calcium hydroxylphosphate at a density of 100 mg/cm3 embedded in a truncated section equivalent to the vertebral bone to simulate the human vertebrae. It is mainly used to check whether the CT machine is normal and whether the operator's steps are correct to ensure the quality of the bone density test.?
(3) CT machine and computer There are no special requirements, as long as the CT machine and computer can operate normally.?
(4) QCT Bone Densitometer System Bone Density Measurement Software This software has taken the advantages of foreign QCT Bone Densitometer System software and combined it with the characteristics of the country; it has taken the WHO QCT Bone Densitometer System Osteoporosis Diagnostic Criteria and also adopted the QCT Bone Densitometer System Osteoporosis Diagnostic Criteria developed by Prof. Yu Wei of the Peking Union Medical College Hospital as recommended by the Chinese Medical Association.
It is very suitable for China's national conditions. As our experts often participate in various bone mineral salts conferences in China, the first-class osteoporosis professors in China provide guidance, and some new academic achievements will be integrated into the bone density measurement software of QCT Bone Densitometer System after being understood and digested by our experts and upgraded in time for the users, so that China's bone density measurement technology will be at the forefront of the world at any time.
3. Principle of QCT Bone Densitometer System Technology QCT Bone Densitometer System is an effective tool to measure the patient's three-dimensional bone density, is the only way to measure the bone mineral content of the vertebral body cancellous and dense bone respectively, is the true meaning of three-dimensional structural measurements.? In the vertebral body bone in the bone cancellous bone mineral content of 20% ~ 40%, bone dense accounted for 60% ~ 80%, but the surface area and volume of bone cancellous ratio is large, its annual metabolic rate of 20% ~ 25%, metabolic rate of conversion is 8 times higher than the bone dense, bone loss is more sensitive than the bone dense, so the QCT Bone Densitometer system is commonly used in the measurement of the bone cancellous.