Prelims Flashcards
Controls the energy level of the x-ray beam, determining the penetration ability
Kilovoltage Peak (kVp)
The raw data the computer receive after the detectors collect the transmitted x-rays is also called
Projections
An essential component of a CT scanner that helps capture the x-ray data used to create cross-sectional images of the body
Detectors
The axial plane, is the third major anatomical plane. It divides the body into upper and lower parts, running horizontally across the body. It is also called
Transverse plane
The relationship between patient couch movement and x-ray beam width
Pitch
This refers to the circular movement of the x-ray tube and the detector around the patient’s body
Rotate
Manages the processing power for reconstruction algorithms and system control
Central Processor (CPU)
The measurement of how far apart two objects must be before they can be seen as separate details in the image
Resolution
A single square, or picture element, within the matrix
Pixel
It gives an image a grainy quality or a mottle appearance
Noise
He developed the first whole-body scanner, which greatly expanded the diagnostic capabilities of Ct
Robert Ledley
An Italian mathematician who proposed a method to represent a single slice of the body on the radiographic film
Allesandro Vallebona
He development of mathematical techniques for reconstructing cross-sectional images by analyzing x-ray data taken from multiple angles
Allan Cormack
Efficiency of a detector to convert photons to light or ions. Controlled by detector material, size and thickness
Absorption Efficiency
Detectors efficiency to convert light or ions to digital signal
Conversion Efficiency
CT Generation uses slip ring technology
6th Generation
The ability to differentiate between small differences in density within the image
Contrast Resolution
Godfrey Hounsfield invented the first CT-scan machine for EMI Ltd. at the central research laboratory in England in ____
1970
Scintillation materials like _____ has 100% AE but has phosphorescence resulting to decrease in response time
Sodium Iodide (NaI)
The following are other names of Computed Tomography except
Multi Slice Tomography (others CTAT, DAT and Body Section Roentgenography)
True or False: Higher kVp increases contrast for soft tissue image
False: Higher kVp = Lower kVp
True or False: The first CAT scanner can produce a single sectional image in 4 hours
False: 4 hours = 9 days
True or False: The speed of the detector to react/recognize incoming x-ray photon and recover for the next input is determined by detector’s stability
False: Detector’s stability = Response Time
True or False: Gas filled detectors cannot be used in 4th generations and up.
True
