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Siemens was the first to combine positron emission tomography (PET) with computed tomography (CT). [25] By creating this hybrid imaging system, Siemens combined the PET scanner's ability to visualize biological processes of life with a CT system's anatomical image of tissues and organs.
This makes CT scan the most appropriate term, which is used by radiologists in common vernacular as well as in textbooks and scientific papers. [218] [219] [220] In Medical Subject Headings (MeSH), computed axial tomography was used from 1977 to 1979, but the current indexing explicitly includes X-ray in the title. [221]
A Siemens SPECT/CT scanner in operation. Siemens Healthineers AG is a publicly listed company that was spun off from Siemens in 2017. As of 2022, Siemens retains a 75% majority stake in Siemens Healthineers. [6]
The company's sales began a steady growth, from $21 million in 1979 to $42 million in 1981. That year, Elscint, which by that time had provided more than 100 CT scanners to hospitals and research institutes around the world, acquired Pfizer's CT scanner business. Elscint's market share grow to 10 percent by the middle of the 1980s. [5]
This technology is the fastest generation of CT scanner to date. Third-generation spiral CT designs, especially those with 64 detector rows, 3×360°/sec rotation speeds, and designed for cardiac imaging, are largely replacing the EBT design from a commercial and medical perspective. However, electron beam CT still offers sweep speeds of ...
Modern SPECT equipment is available with an integrated X-ray CT scanner. As X-ray CT images are an attenuation map of the tissues, this data can be incorporated into the SPECT reconstruction to correct for attenuation. It also provides a precisely registered CT image, which can provide additional anatomical information.
[2] [3] Due to the large volumes and rates of data required (up to several hundred million photon interactions per mm 2 and second [4]) the use of PCDs in CT scanners has become feasible only with recent improvements in detector technology. As of January 2021 photon-counting CT is in use at five clinical sites.