Digital Imaging Unit 2 - Processing (Review ) RT5

Pataasin ang iyong marka sa homework at exams ngayon gamit ang Quizwiz!

There are two types of PSP image receptors. Name them.

Cassette-based and cassette-less

All of the following are advantages to digitizing radiographs except:

D. Digitization can contribute additional artifacts to digital images

The potential to gradually increase patient exposure over time is known as:

D. Dose creep

EI is the way to let the technologist know whether the correct _____________ was used:

D. Exposure technique

The sampling frequency for PSP plates or the detector elements for flat-panel receptors affects the

D. Matrix

The look-up-table changes the _________ of the pixels to the contrast levels that are best for each anatomical part.

D. Numerical value

Trapped energy in the PSP is released when the laser interacts with the __________ layer.

D. Phosphor

A rotating polygonal mirror uses a __________ ____________ to direct the laser beam to the PSP receptor.

D. Point scanner

Optimal EI ranges for each anatomical part should be set by the:

D. Radiologist

EI is the vendor neutral term used by technologists to determine the approximate level of radiation exposure to a:

D. Receptor

Which device allows for an increased scanning precision compared with a mechanical arm?

D. Rotating mirror allows the laser beam to scan across the PSP faster and with more precision

PSP plates are erased after processing by exposing the plate to:

C. High-intensity light

When using a flat-panel detector, the technologist does not touch the:

C. Image detector

During the PSP image extraction, the image is extracted at the __________________ level?

C. Phosphor crystal level

In a flat panel detector element, a DEL is also known as a(n):

C. Pixel

In regards to the PSP digital image, changing sampling frequency affects the:

C. Spatial resolution

In a flat-panel imaging system, electrons are converted into digital values by a(n):

C.ADC

Film digitizers convert film-screen images into _________________:

C. Digital data

Histogram defined

A graphical representation of exposure values extracted from an image receptor

What do both a charge-coupled device and a complementary metal oxide semiconductor need to change x-rays into light?

A. A scintillator - it coverts the xray photons to light

A DAP meter measures patient dose as the x-rays:

A. Enter the patient's skin

Why is scanning the bar code on a PSP plate extremely important? Because it links the image data with the correct:

A. Patient

The DAP meter does not indicate the amount of exposure delivered to the image receptor:

A. True- it measures the actual patient exposure dose

Name the two formats that can extract and analyze the data that creates the final digital image viewed on a monitor:

A. priori histpgram analysis B. neural histogram analysis

Type 1 Histograms are best for

Ankles, extremities

The process of matching the captured image values to standardized values is known as:

B. Automatic rescaling

In flat-panel detector elements, what collects the electrons that are extracted from the detector assembly and then converted into a digital value by the ADC?

B. DEL

All of the following are examples of EIs except:

B. DQE

A digitized image cannot be treated like any other digital image: T/F

B. False

Plates must be erased following every other exposure.

B. False

Both the direct and indirect methods of image capture convert light into x-rays.

B. False Indirect coverts to light then to electrical Direct coverts to electrical

EIs are measurements of actual skin dose: A. True B. False

B. False- they measure the approximate level of exposure to the iR

The EI is calculated based on analysis of how values are distributed within the:

B. Histogram

The acronym EI is a vendor-neutral term that stands for exposure:

B. Indicator

When exposed to the x-ray beam, the PSP plate stores electrons that are dislodged by the beam. Those electrons located in the electron trap form what?

B. Latent image

In a PSP plate reader, the light guide collects the light and directs it into a:

B. Photomultiplier tube

Visual cues that an image has been overexposed are not easily seen in digital radiography because of:

B. Rescaling

If a PSP plate is processed using the wrong anatomical menu, what could happen?

B. The EI number might display improperly

When a PSP plate reader is unable to identify the collimated borders of the image:

B. The image quality is poor

Which histogram analysis is used for torso, spine, skull and pelvic examinations?

B. Type 2 histogram

Neural analysis compares exposure data from the receptor with:

B. Values in a predefined data set

Flat panel exposure indicators vary by manufacturers. The value for Phillips, Siemens or Canon are

EI EXi REX

The addition of a metal prosthesis into the image data set affects:

Image brightness Image Contrast EI

Neural Histograms

Image data compared to two or more predefined histograms.

Type 3 a priori analysis is unique because it takes into account which patient characteristic?

Prosthesis or barium filled

Type 3 Histograms best for:

Prosthetic or barium full stomach

Manufactures have specific EIs they are slightly different from each other. Name the types of EIs

S number- sensitivity number Exposure index abbreviated EI Logarithm -IgM

Type 2 Histograms best for

Toros spine skull, pelvic

In the flat-panel detector dose area, the DAP meter is located in the _______________________.

collimator box

EXI is used in what type of radiography

in flat-panel radiography

Both the PSP receptor and the flat-panel receptor must identify the exposure field. The receptor recognizes the exposure field by the number of electrons present in the DEL. How do the two receptors differ in the way the exposure field is identified? Explain

psp - must identify the exposure field, if it cant then it looks at the entire plate which leads to poor image quality. flat panel - only analyzes the exposed area inside the collimation border

During PSP Receptor erasure, do "light bulbs" affect image quality? Explain your answer.

yes, when the bulbs are defective or dirty the device can't completely erase plates & subsequent images are or poor quality


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