Exam 5: Flat-Panel Digital Radiography

Since there are different sizes of body parts to be imaged, different sizes of ____________________ are commercially available for clinical imaging.

The narrower the LSF, the better the ____________________ resolution.

Which of the following addresses the appearance of the image displayed on a monitor for viewing and interpretation by a radiologist?

Which of the following is a complex mathematical function that measures the ability of the detector to transfer its spatial resolution characteristics to the image?

Under random conditions it has been shown that the quantum efficiencies (based on the X-ray absorption properties of the detector converter materials)at 70 kV is about 67% for a-Se and 77% for CsI phosphor.

The raw digital data from a detector has a high image contrast simply because of the wide exposure latitude of the digital detector.

The flat-panel TFT digital detector is designed as a matrix of detector elements, each of which can be regarded as a(n)____________________.

Problems arising as a result of image ____________________ may also be related to the differences in the acquisition workstation and the higher-quality PACS workstation used by the radiologist.

A higher MTF value at a higher spatial frequency means that the detector provides better spatial resolution than lower MTF values at low frequencies.

An important imaging performance characteristic of a flat-panel detector that has an impact on clinical practice is image lag.

The dynamic range of a digital detector is the response of the detector to different levels of ____.

Which of the following deals with the efficiency of a detector to convert the x-radiation signal at its entrance window into useful image signal?

Which of the following describes the ability of the imaging system to resolve fine details present in an object?

Which concept examines the response of the image receptor (screen-film detector or digital detector)to the radiation falling upon it?

While indirect detectors use a phosphor, direct detectors use a(n)____________________.

All digital imaging systems have what is referred to as the limiting resolution, which is the spatial frequency limit that is obtained at an MTF value of 0.1.

Which of the following images is obtained initially from the detector and contains artifacts due to the bad detector elements?

At ____ kV, efficiencies are 37% for a-Se and 52% for CsI.

Which of the following plays a role in image display optimization?

Too much edge enhancement produces image noise and creates ____.