The duty cycle is the part of the operation cycle of an accelerator during which radiation is produced. The duty cycle is the product of the pulse duration and the pulse-repetition frequency.

See also Duty Cycle in MRI.

(FNH) The focal nodular hyperplasia is a hypervascular, benign focal liver lesion. Various liver imaging techniques are common to differentiate FNH from a malign lesion, such as contrast enhanced ultrasound, MRI or a CT multi phase study.

The France-based Guerbet Group is highly specialized in contrast media for medical imaging. Its strategic goal is to be a key player in this market. Guerbet Group produces products for x-ray imaging, MRI, ultrasound imaging and imaging through radioactive tracers.

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As a full-line supplier of medical imaging equipment in Japan, Hitachi Medical Corporation (HMC) founded HMSA 1989 to provide a direct link to the U.S. marketplace. HMSA is responsible for the sales, marketing and service of all Hitachi Open MRI, PET/CT, Ultrasound, and Computed Tomography products in the United States.

In December 2019 Japan's Fujifilm announced the acquisition of Hitachi's diagnostic imaging business for 179 billion yen ($1.63 billion). This includes Hitachi’s CT, MRI, X-ray, and ultrasound imaging operations, also its electronic health record business. Fujifilm expects the deal to close in July 2020 subject to regulatory clearances.

Interventional radiology is an area of clinical subspecialty which uses various radiology techniques (such as fluoroscopy, ultrasound, computed tomography, and MRI procedures) to guide procedures such as a biopsy, inserting catheters, place wires, draining fluids, dilating or stenting narrowed ducts or vessels to diagnose or treat different conditions.

See also CT Guided Biopsy, Angioplasty, Coronary Angiogram and Interventional Ultrasound.