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imagequalityactivity
image quality
Question | Answer |
---|---|
Responsibility of the CT technologist | 1. A thorough understanding of the parameters of CT image quality. 2.Able to identifiy causes of Ct image degradation. 3. solve technical solutions in response to image quality issues |
The __data collected from the patient is subject to preprocessing before it oes to the host computer | Raw data |
The mathemathical technique for estimation an unknown value | interpolation |
The first operation to which raw data is subjected is referred to | convolution |
Which of the following refers to a defined set of instruction for solvig a problem | algorithm |
the basic problem of the back-projection algorithm is | classical star pattern in the image, blurred, not dx, |
where is convolution performed | array processor |
The most common image processing technique used in CT is | Windowing |
Windowing refers to | gray scale manipulation using CT numbers |
The range of CT numbers is defined as the | window width |
The center of a range of CT numbers is | Window level |
As the WW increases, picture contrast | decrease |
The process of applying filtration to the data is called | convolution |
Which algorithm is aka summation | back-projection |
An advantage to MPR is it enables visualization of specific structures in relation to surrounding structures | True |
Convolution kernels can be applied only to raw data | true |
new generation of multislice computed tomography scanners requires modified image reconstruction algorithms | true, because those with 16 and greater detector requires modified image reonstruction algorithms |
class of analythical algorithms for CT | filtered back projection, Fourier reconstruction |
What algorithms is commonly used in CT scanners | filter back projection, |
Image data are obtained | after back projection, |
describes the beam that diverges from the x-ray tube to the outer edges of the detectors | cone beam, beam thatdivergence from the x-ray tube to the outer edges of the detectors. |
Filtered back projection is also referred to as the ________ | convolution method |
Filtered back projection is also referred to as the | convolution method |
Which of the following allows the technologist to alter image contrast, | window controls |
What generates sagittal, coronal, and paraxial images from transaxial slices | multiplanar reconstruction |
As the window width gets lower (50) the image get darker because more of the ct numbes are displayed | false |
Through the manipulation of computed tomography numbers of the various tissues, the icture can changed to school | true |
A large window width mean a long gray scale | true |
What determines the maximum number of shades of gray to be displayed on the tv monitor? | window width |