Definitions
The time needed to switch on the x-ray tube.
What is interrogation time?
When used in digital fluoroscopy it provides high spatial resolution, signal-to-noise ratio, and detective quantum efficiency.
What is a charge-coupled device (CCD)?
A recent advancement in digital fluoroscopy used in place of an image intensifier.
What are flat-panel detectors?
The radiation dose rate is lower for this type of fluoroscopy.
What is digital?
This fluoroscopic feature allows the position of collimator plates to be viewed in the monitor without exposing the patient to radiation?
What is last image hold?
Two-dimensional digital image cell.
What is a pixel?
This component is uniquely essential to digital fluoroscopy.
What is an analog to digital converter (ADC)?
Digital imaging systems require a _____-line video system.
What is 1024?
A 525-line video system is adequate for this type of fluoroscopy.
What is conventional?
Digital imaging systems use at least ____ monitors.
What is 2?
The time required for the x-ray tube to be switched off.
What is extinction time?
This type of detector is coated with amorphous selenium and converts exit radiation into electrical charge.
What is a direct conversion detector?
The minimum acceptable TV signal-to-noise ratio for digital fluoroscopy.
What is 1000:1?
Compared with conventional fluoroscopy, digital fluoroscopy is conducted at a much _____ tube current.
What is higher?
Operational and performance inspection of equipment should be done at least every _____ months.
What is 6?
The fraction of time that the x-ray tube is energized.
What is duty cycle?
An expression of the potential radiation exposure level that is required to produce an optimum image.
What is DQE?
Digital fluoroscopy systems with hybrid capabilities use both _____ and _____ subtraction.
What are temporal and energy?
A digital imaging systems with a dynamic range of 2^10 will be able to reproduce how many shades of gray?
What is 1024?
This operation reduces overall patient dose and an operation that reduces image noise by averaging multiple image frames together.
What is frame averaging?
The ability of the detector to accurately capture the range of photon intensities that exit the patient.
What is dynamic range?
This is mounted on the output phosphor of the image intensifier tube and is coupled through a fiber optics or lens system.
What is a CCD?
Flat panel detector fluoroscopy units operate at what mA?
What is 50-1200 mA?
A principal advantage of digital fluoroscopy over conventional fluoroscopy for subtraction studies.
What is contrast enhancement?
X-ray intensity at the table top should not exceed _____mGya/min.
What is 88?