So sánh phương pháp

	DEXA	Tái tạo lặp CT
Lĩnh vực	Chẩn đoán hình ảnh y học	Chẩn đoán hình ảnh y học
Họ	Process / pipeline	Process / pipeline
Năm ra đời	1987	1974
Người khởi xướng	Harold Wahner	Richard Gordon
Loại	X-ray-based bone density measurement	Algorithm for tomographic image reconstruction
Công trình gốc	Kanis, J. A. (1994). Assessment of fracture risk and its application to screening for postmenopausal osteoporosis. World Health Organization Technical Report Series, 843, 1-129.	Gordon, R., Bender, R., Herman, G. T. (1974). Algebraic reconstruction techniques (ART) for three-dimensional electron microscopy and X-ray photography. Journal of Theoretical Biology, 29(3), 471-481.
Tên gọi khác	Dual X-ray absorptiometry, DXA, bone densitometry	MBIR, ASIR, IR-CT, statistical reconstruction
Liên quan	5	5
Tóm tắt	Dual-Energy X-ray Absorptiometry (DEXA or DXA) is a non-invasive imaging technique that quantifies bone mineral density (BMD) by measuring the attenuation of X-rays at two different energies as they pass through bone and soft tissue. First developed by Wahner and colleagues in 1987, DEXA has become the gold standard for osteoporosis screening and fracture risk assessment. It is recommended by the World Health Organization for diagnosing osteoporosis and monitoring treatment response.	CT Iterative Reconstruction (IR) is a computational technique that reconstructs tomographic images from raw X-ray projection data by iteratively refining an estimate of tissue attenuation until it matches the measured projections. Developed from algebraic reconstruction techniques pioneered by Gordon in 1974, iterative reconstruction has revolutionized clinical CT by enabling high-quality images at reduced radiation dose. Variants such as Adaptive Statistical Iterative Reconstruction (ASIR) and Model-Based Iterative Reconstruction (MBIR) are now standard on modern CT scanners.