Digital Imaging Flashcards
Is a process of acquiring images of the body using X-Rays,displaying them digitally,and viewing and storing them on a computer and in computer files
Digital Imaging
Stores the latent image of the body part until it is processed:
Photostimulable Phosphor (PSP)
Are made of barium fluorhalide with europium:
IP Phosphors
Is a two step process in which the X-Ray energy is first converted into light and then converted into an electric signal:
Indirect Conversion
Is a type of indirect conversion detector:
The charged coupled device (CCD)
Complementary Metal Oxide Semiconductor
CMOS
Is a one-step process and convert the X-Ray energy directly to an electric signal through amorphous selenium detectors without the light conversion
Direct Conversion
Is a series of thousands of very small boxes or squares
Actual Matrix
Squares are known as picture elements or pixels:
Individual matrix squares
Are defects in the components,which is a possibility in any imaging system:
Dead Pixels
Is the amount of detail or sharpness of an image as seen on the monitor:
Spatial Resolution
The larger the matrix and the smaller the pixels:
The greater the spatial resolution
Is the ability to distinguish anatomical structures of similar subject contrast:
Contrast Resolution
Is the response of the detector to different levels of radiation exposure:
Dynamic Range
Describes the ability of the digital system to convert the X-Ray input into electric signal into a useful radiographic image
Signal-to-noise ratio (SNR)
Refers to the useful information in the image:
Signal
Refers to the amount of information that is not usefu:
Noise
Modulation Transfer Function
MTF
Used to measure the capacity or accuracy of the digital detector to pass its spatial resolution characteristics to the final image
MTF
A graph of the minimum and maximum signals in the image
Histogram
A file of stored images for each projection:
Look Up Table (LUT)
Controls the density of the image:
Window Level
Controls the contrast in the image:
Window Width
Allows the limited operator to add text that is useful to have on the image:
Image Annotation
Is a processing technique in which images can be made sharper and have greatly increased contrast
Edge Enhancement
Digital Imaging and Communication in Medicine:
(DICOM)
Is a universally accepted standard for exchanging medical radiographic images:
DICOM
Electronic Medical Record
(EMR)
Electronic Health Record
(EHR)
Radiology Information System
(RIS)
Picture Archival and Communication System
(PACS)
