Vertaile menetelmiä

	DEXA	CT Iteratiivinen rekonstruktio
Tieteenala	Lääketieteellinen kuvantaminen	Lääketieteellinen kuvantaminen
Menetelmäperhe	Process / pipeline	Process / pipeline
Syntyvuosi	1987	1974
Kehittäjä	Harold Wahner	Richard Gordon
Tyyppi	X-ray-based bone density measurement	Algorithm for tomographic image reconstruction
Alkuperäislähde	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.
Rinnakkaisnimet	Dual X-ray absorptiometry, DXA, bone densitometry	MBIR, ASIR, IR-CT, statistical reconstruction
Liittyvät	5	5
Tiivistelmä	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.