Description

a special diode tube that converts electrical energy into x-rays.
computer that serves as a digital post- processing station or an image review station.
adjustment of the window level and window width ( brightness and image contrast) by the user.
controls the gray level of an image ( the contrast)
controls the brightness of an image within a certain range.
volume element; corresponding to a three- dimensional tissue volume, having height, width, and depth; each pixel represents a voxel when an image is viewed.
refers to acquisition of a volume of CT data; the patient moves through the grantry with uninterrupted rotation and output of the x-ray tube; also may be referred to as helical or spiral scanning.
what the patient lays on when getting a x-ray or CT
device that transmit electrical energy and allow continuous rotation of the x-ray rube for volumetric acquisition.
section of the object that is being scanned.
preliminary image of a CT examination that is used to plan the range of the scan; depending on the vendor, it may be called a tomogram or a scout.
predetermined procedure; in CT, protocol refers to the parameters of an examination.
picture element; an individual matrix box; each pixel is assigned a CT number.
identifies the relationship between slice thickness or beam collimation and the distance the table travels every time the tube rotates.
includes the keyboard, mouse, and multiple monitors.
hardware and software that allow computers to be connected for the purpose of sharing resources and interacting.
method by which images acquired in the axial plane may be reconstructed in the coronal or sagittal plane.
technique used to view vessels as demonstrated in CT angiography.
series of rows and columns ( of pixels) that give form to the digital image
component of a CT system that houses the x-ray tube, detectors, and collimators.
the physical component consisting of multiple detectors that efficiently absorb the transmitted radiation and accurately convert it to an electrical signal for display on a computer workstation.
numbers that represents the attenuation value for each pixel, relative to water.
Radiographic examination that displays sectional anatomic images in axial, sagittal, or coronal planes.
what the images are sent to for image reconstruction.
located immediately below the tube window where the entrance shutters limit the x-ray beam field size.
undesirable feature or density in an image not representative of anatomy.
the simplest type of beam restricting device, constructed of a flat piece of lead that has a hole in it

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