CT scan
computed tomography - correct answer ✔✔-merges x-ray technology with the computer to provide
detailed digital cross-sectional images of the body relatively free from superimposition of the different
tissues.
-revolutionized the ability to visualize soft tissues
principles of CT - correct answer ✔✔-employs x-rays that are attenuated by body tissues. the
radiodensities of the tissues are represented in the image as shades of gray
-creates images based on cross-sectional (axial) slices, created by up to 1000 projections from different
angles
components of CT scanner - correct answer ✔✔1: the gantry: contains the x ray tube
2:operator's console
3: the computer
the detectors - correct answer ✔✔-x rays are attenuated by body tissues and then exit the pt's body as
remnant radiation, similar to conventional radiography.
-up to 1000 detectors are arranged in an array, encircling the pt, for the purpose of measuring this
remnant radiation
-modern units have 4-16 arrays
data anquisition system - correct answer ✔✔-amplifies the signal from the detectors
-incoming signal is in the form of a varying electrical current= ANALOG SIGNAL
-system converts it from analog to digital form and then sends it to the computer
scout image - correct answer ✔✔2 dimensional digital radiograph-localizes the structures to be scanned
pitch - correct answer ✔✔movement of the tabletop
represents the ratio of tabletop movement to slice thickness
computed tomography - correct answer ✔✔-merges x-ray technology with the computer to provide
detailed digital cross-sectional images of the body relatively free from superimposition of the different
tissues.
-revolutionized the ability to visualize soft tissues
principles of CT - correct answer ✔✔-employs x-rays that are attenuated by body tissues. the
radiodensities of the tissues are represented in the image as shades of gray
-creates images based on cross-sectional (axial) slices, created by up to 1000 projections from different
angles
components of CT scanner - correct answer ✔✔1: the gantry: contains the x ray tube
2:operator's console
3: the computer
the detectors - correct answer ✔✔-x rays are attenuated by body tissues and then exit the pt's body as
remnant radiation, similar to conventional radiography.
-up to 1000 detectors are arranged in an array, encircling the pt, for the purpose of measuring this
remnant radiation
-modern units have 4-16 arrays
data anquisition system - correct answer ✔✔-amplifies the signal from the detectors
-incoming signal is in the form of a varying electrical current= ANALOG SIGNAL
-system converts it from analog to digital form and then sends it to the computer
scout image - correct answer ✔✔2 dimensional digital radiograph-localizes the structures to be scanned
pitch - correct answer ✔✔movement of the tabletop
represents the ratio of tabletop movement to slice thickness
