Image Sharpness Measurement Quiz

Play an AI-generated podcast conversation about this lesson

How is the sharpness of an image typically measured?

By asking the question 'can I see the bony trabeculae?'

By determining if fine structures can be visualized (correct)

By measuring the ability to resolve the smallest object in the image

By analyzing the resolution of the imaging system

What is the limiting resolution of an imaging system expressed in?

Pixels per square millimeter (px/mm^2)

Line pairs per centimeter (lp/cm)

Line pairs per millimeter (lp mm^-1) (correct)

Resolution units per inch (rpi)

How can sharpness be subjectively determined in an image?

By counting the number of visible structures in the image

By viewing and asking 'can I see the bony trabeculae?' (correct)

By measuring the luminance values of the image

By analyzing the pixel density of the image

Which factor does not affect the subjective determination of sharpness within an image?

Temperature of the room Signup and view all the answers

In Computed Radiography (CR), how is the radiographic image captured?

Utilizing a phosphor plate for image capture Signup and view all the answers

What distinguishes Direct Digital Radiography (DDR) from Computed Radiography (CR)?

CR provides immediate image display, while DDR does not Signup and view all the answers

Why should measurements for the size of any object never be taken from a monitor in radiography?

The monitor displays images at a life-sized scale, not at their actual size. Signup and view all the answers

How can the size of a body structure be accurately determined in radiography?

Imaging a known sized object within the patient image for size comparison. Signup and view all the answers

What causes image distortion in radiography if not all parts of the image are magnified equally?

Differences in magnification across different parts of the object. Signup and view all the answers

How can distortion be minimized in radiography when imaging a thin, flat object?

Positioning the part being radiographed parallel to the detector. Signup and view all the answers

What happens to image quality if the object and detector in radiography are not parallel?

Distortion due to differences in magnification across the object. Signup and view all the answers

What technique helps avoid image distortion when conducting radiography?

Placing the detector parallel to the object being imaged. Signup and view all the answers

What is the phenomenon known as where the emitted light intensity is proportional to the original X-ray intensity?

Photostimulable luminescence (PSL) Signup and view all the answers

Which technology is used in digital radiography that involves an X-ray scintillator bonded to a read-out array?

Amorphous silicon photodiode/thin-film transistor array Signup and view all the answers

What process is carried out to remove any remaining trapped electrons from a phosphor plate after image digitization?

Erased with bright white light Signup and view all the answers

Which immediate image display technology involves a flat panel with a scintillator and an amorphous silicon photodiode thin-film transistor array?

Direct Digital Radiography (DDR) Signup and view all the answers

Which detector technology can be constructed in the form of a flat panel?

Amorphous selenium bonded to a TFT read-out array Signup and view all the answers

After being erased with bright white light, what is the phosphor plate ready for?

Another examination Signup and view all the answers