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LRA 221 Finals Exam Questions And Answers
Film and intensifying screens are used primarily in? - Answer conventional radiography CR acquires an image through: - Answer The use of a storage phosphor plate Technologist efficiency ratings are generally comparable when comparing conventionalradiography with ______ radiography. - Answer computed
The active element in a storage phosphor is: - Answer barium fluorohalide Regarding PSP image capture, which of the following is scanned over the phosphorplate to release the latent image? Answer Focused laser light
X-ray energy related in indirect capture DR will stimulate a _________ changed into anelectrical signal. Answer Scintillator
The _______converts x-ray energy directly to a digital electrical signal. Answerphotoconductor
Exposure latitude is to conventional radiography as _______ is to DR. Answer dynamicrange
A look-up table maps: - Answer image grayscale values All of the following are components of a PACS except - Answer independent kilovoltagepeak and milliampere-second stations.
Like CR, DR is able to utilize the same diagnostic equipment as exists in today's imagingdepartments. - Answer False-Can't use the same equipment
Indirect capture DR converts absorbed x-ray energy into visible light. - Answer True-indirect DR convert X-ray energy to visible light
This is the standard that enables the imaging modalities and the PACS to speak acommon language. - True
Which one of the following statements is not true? Changing the matrix and the FOV willnot change the size of the pixel. - Not true
Each square in a matrix is called a - picture element The number of bits per pixel is known as bit: - depth Which one of the following statements is NOT true?? - Answer Exposure index describesthe quantity of exposure to the patient. Deviation index describes the difference between expressed in logarithmicfashion. - Answer actual exposure; target exposure How dark or light a digital image appears on a display monitor is described as: - Answerbrightness
The ability of a digital system to display the subtly different shades of gray is called:-Answer contrast resolution
The ability of an imaging system to demonstrate small details of an object is known as:-Answer Spacial Resolution
The improper algorithm application may result in - Answer degradation of the image Amplification of the frequencies of the areas of interest is called - Answer edgeenhancement
Suppressing the frequencies in the areas of interest is called - Answer masking Low-pass filtering is also called: - Answer smoothing High-pass filtering is useful for enhancing - Answer organs and soft tissue Image level parameters control image - Answer brightness Window width controls the ratio of black and white, also known as - Answer contrast Excess light in the eye when viewing an image is called ______ glare. - Answer veil An image manipulation process that fills in the background to cause it to be darkened iscalled - Answer shuttering
The combination of two or more images into one single continuous image is called image- Answer stitching
The workstation function that allows selection of preset terms or manual text input istermed image - Answer annotation
Magnification of the entire image at the workstation is termed - Answer zoom
Proper patient demographic input is the responsibility of the - Answer technologist The shape of the histogram is anatomy specific. - Answer True The PSP cassette is backed by aluminum that - Answer absorbs backscatter x-rays Which of the following prevents static build-up, dust collection, and mechanical damageto the imaging plate? Answer Felt material
The layer of the imaging plate that captures electrons during exposure is the _____ layer.Answer Active
The layer of the imaging plate that absorbs exciting light and reflects emitted light is the- Answer color layer
The reflective layer - Answer Sends light in a forward direction Image information on the barcode label matches the - Answer patient identifier The phosphor layer consists of phosphors of the - Answer Barium fluorohalide family On irradiation, the stimulated electrons enter the - Answer active layer At the formation of a laser beam, the atoms at both ends reflect energy back and forthso that the atoms - Answer bombard each other
Coherent light is formed by the laser because the photons - Answer travel in the samedirection
mA-s selected for the number of electrons needed When insufficient light is produced by the phosphor of the imaging plate, the image willbe grainy
Quantum mottle is caused by Answer insufficient light Which of the following should be consideration when selecting the PSP cassette?Answer size and type
The higher the number of pixels in a matrix, the Answer Higher the image resolution Grid use for PSP examinations is more critical than in film/screen radiography becauseCR Answer imaging plates record more densities.
Frequency describes the number of grid lines per centimeter or lines per inch of grid Grid ratio describes the Relationship between the height of the lead strips to theinterspace
Which of the following require more critical beam centering? Focused grids Collimation to a smaller area decreases scatter Shuttering is a post-exposure image manipulation technique that is added to the screenimage
A radiographer can add credibility to his or her skill by - Answer using personal position
indicators. The EIP number is - Answer an indication of radiation absorbed by the imaging plate Cracks in the imaging plate can be caused by: - Answer removing and replacing theplate in the reader
Intermittent extraneous line patterns areartifacts. - Answer plate reader
PSP phosphor speed and radiographic film speed are always equivalent. - Answer False The PSP imaging plate does not require periodic erasure because of its ability to recordbackground radiation. - Answer False
Less kVp is needed with conventional radiographic screens than is necessary for PSPsystems. - Answer False
Grid lines projected onto the imaging plate will not interfere with the image. - AnswerFalse
Collimation can be replaced by shuttering. - Answer False Images must be labeled only by using computerized markers. - Answer False Scintillators are a type of phosphors that - Answer Produce light upon absorption ofX-rays
A device that utilizes a photosensitive array along with small pixels to convert visible
A device that behaves like a camera in an indirect conversion detector is called a -Answer CCD
Which of the following is the best description of a capacitor? - Answer It converts x-rayphotons to light and stores it.
Which of the following statements about scintillators is correct? - Answer The amount ofx-rays absorbed depends on the type of scintillator.
The readout process requires that _______ and _______. - Answer the flow of electrons istimed; multiple voltage changes occur
most common types of noise that affects image quality include all of the following except- Answer quantum noise
When compared with a CMOS, CCDs: - Answer use more than 100 times the power The most popular base material used in integrated circuits is - Answer Silicon A very sensitive indirect conversion system that requires much less fill space than CCDsis called a: - Answer CMOS
specialized pixels in a complementary metal oxide silicon system are struck with X-rayphotons - Answer All of the above
Quantum efficiency is a measure of the - Answer Amount of electrons produced byrelative to the incident light from the scintillator
Some advantages to CCDs include - Answers A and C only
The number of electron-hole pairs produced is related to the amount of light absorbed. -True
The polysilicon layer within a CCD acts as an insulator. - False CCDs use more power than CMOS - True
