Electron beam computed tomography picture

  • What is the electron beam computed tomography used for?

    Electron-beam computed tomography (EBCT) is a fast test to look for calcium build-up in the heart's arteries.
    It uses an electron gun to scan the chest..

  • As the x-rays leave the patient, they are picked up by the detectors and transmitted to a computer.
    Each time the x-ray source completes one full rotation, the CT computer uses sophisticated mathematical techniques to construct a two-dimensional image slice of the patient.
  • CBCT has much greater noise and artifact presence; however, the signal-to-noise ratio is lower compared to fan beam CT.
    The CBCT will have more grainy images, as the “true” signal will be drowned out by the large noise signal.
EBCT makes use of a stationary electron emitter which does not circle around the patient. This electron emitter is large and partially surrounds the imaging circle. An electron beam focus is swept electronically, not mechanically, as in conventional CT, along a tungsten target to emit X-rays from different angles.
Electron beam computed tomography (EBCT) is a specific form of computed tomography (CT) in which the X-ray tube is not mechanically spun in order to rotate 
The major advantage is the fast acquisition time, which results in less need for sedation of the central nervous system. The imaging of moving structures is less blurry. As EBCT generates X-rays with an electron beam, the radiation exposure is decreased.


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