QCT

QCT is an acronym that can refer to multiple concepts across different fields. The intended meaning is usually clear from the context, with the most common usages in medical imaging and quality control.

Quantitative Computed Tomography (QCT) is a medical imaging technique used to measure bone mineral density. Unlike dual-energy X-ray absorptiometry (DXA), QCT provides three-dimensional volumetric measurements in milligrams per cubic centimeter and can separate trabecular from cortical bone. It is used in osteoporosis assessment, fracture risk research, and monitoring treatment effects. Measurements require calibration phantoms and standardized protocols. Advantages include sensitivity to changes in trabecular bone and the ability to assess regional bone density, while limitations include higher radiation exposure, longer scan times, cost, and variability between scanners that necessitates site-specific reference data.

Quality Control Test (QCT) or Quality Control Techniques, used in manufacturing and software development, refers to testing and procedures designed to verify that a product meets its specified requirements. A quality control test suite may include dimensional checks, functional tests, performance metrics, and reliability assessments. QCT activities are part of broader quality assurance programs and inform corrective actions, process improvements, and certification of product readiness.

Other usages exist in industry and research contexts, and the exact meaning of QCT should be inferred from field-specific documentation or definitions. In case of ambiguity, clarification is needed to determine the intended meaning.