Exam 5: Flat-Panel Digital Radiography

Which of the following will detect the light from the CsI scintillator in the indirect flat-panel TFT detector?

Flat-panel detectors can be used in portable radiography applications and in applications involving ____________________.

With indirect flat-panel TFT digital detectors, what is used to first convert X-ray photons into light photons?

Flaws include dust, scratches, chemical reactions among the various materials that the detector is made of as well as defective ____________________.

Which layer used in the indirect flat-panel digital detector is usually either cesium iodide (CsI)or gradolinium oxysulfide (Gd?O?S)?

Flat-panel digital detectors are complex devices and pose numerous challenges in the ____________________ process.

In imaging, the goal is to obtain good ____________________ information in the image.

Which of the following reduces the output image from the scintillator phosphor to the size of the CCD array?

____ refer(s)to the persistence of the image; charge is still being produced after the radiation beam from the X-ray tube has been turned off.

The ____________________ technology was developed as a dedicated system specifically for imaging the chest.

The purpose of the a-Si photodiode layer is to convert the light from the X-ray detection ____________________ into electrical charges.

One important physical concept that is essential to understanding the rationale for the use of specific X-ray ____________________ and a-Se in digital detectors is that of X-ray attenuation or absorption.

In imaging applications, because contrast resolution (the ability to resolve small differences in tissue contrast)is mandatory for diagnostic interpretation, ____ is important.

An MTF of ____ represents a perfect transfer of spatial and contrast information.

For digital imaging systems, the spatial resolution depends on the size of the ____________________ in the matrix.

The purpose of a photodiode is to collect and store the electrical charge produced in the a-Si photodiode array.

For the flat-panel TFT digital detectors used in ____________________, the readout process and readout electronics are somewhat different to the detectors used for radiographic applications.

The flat-panel TFT digital detector uses complex and sophisticated electronic circuitry to read out the electrical charges produced and stored in the matrix array.

Optimization of the image displayed on monitors for viewing by both technologists and radiologists requires a good working knowledge of not only image processing but also display ____________________ principles and technology.

The column artifact arising from a bad column of pixels indeed provides a rationale for ongoing ____________________ of the digital imaging system.