Ch 13 Image Quality and Production Quiz

What are the three visibility components of every image?

• Brightness, contrast, and noise

• Sharpness, color, and texture

• Resolution, depth, and clarity

• Hue, saturation, and brightness

Answer explanation

The three visibility components of every image are brightness, contrast, and noise. Brightness affects the lightness, contrast determines the difference between light and dark areas, and noise refers to unwanted variations in the image.

What is the importance of maintaining the characteristics of the projected image during the stages of image production?

• To ensure the image is colorful

• To maintain the quality of the final digital image

• To reduce the cost of production

• To increase the speed of image processing

Answer explanation

Maintaining the characteristics of the projected image is crucial to ensure the quality of the final digital image. This affects clarity, color accuracy, and overall visual appeal, which are essential for effective communication.

What is the role of the analog-to-digital converter (ADC) in the imaging process described?

• It captures the projected image directly.

• It stores the latent image permanently.

• It converts the analog image to a digital signal.

• It displays the final digital image.

Answer explanation

The ADC's role is to convert the analog image captured by the imaging system into a digital signal, enabling further processing and analysis. This is crucial for digital imaging systems.

How is the brightness of the image controlled in digital radiography?

• By the exposure to the detector.

• By the type of image receptor used.

• By postprocessing applied to the image data.

• By the initial image acquisition process.

Answer explanation

The brightness of the image in digital radiography is primarily controlled by postprocessing applied to the image data, allowing for adjustments after the initial acquisition to enhance visibility and detail.

What is required for an image to be visible within your field of view?

• Uniform brightness and intensity

• Differing shades of brightness and darkness

• Pure white light

• Pure black light

Answer explanation

For an image to be visible, it needs differing shades of brightness and darkness. This contrast allows our eyes to perceive shapes and details, making the image recognizable.

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NGSS.HS-PS4-4

Why might an image with excessive contrast lose details?

• It becomes too colorful

• It reduces to black or white with few intermediate shades

• It becomes too bright

• It becomes too dark

Answer explanation

An image with excessive contrast often loses details because it reduces to black or white with few intermediate shades, eliminating subtle variations and textures that provide depth and clarity.

How is the brightness of a digital diagnostic image primarily adjusted?

• By changing the inherent brightness level

• By adjusting the display monitor

• By altering the shape distortion

• By modifying the magnification

Answer explanation

The brightness of a digital diagnostic image is primarily adjusted by changing the settings on the display monitor, which directly affects how the image is viewed. Other options do not primarily influence brightness.

What is the term used to describe the overall darkness of a diagnostic image?

• Optical density

• Brightness

• Contrast

• Resolution

Answer explanation

The term 'optical density' refers to the overall darkness of a diagnostic image, indicating how much light is absorbed. It is distinct from brightness, contrast, and resolution, which describe different aspects of image quality.

What device is used to measure the darkness of different densities in a hard-copy radiograph?

• Densitometer

• Spectrometer

• Photometer

• Calorimeter

Answer explanation

A densitometer is specifically designed to measure the darkness or optical density of radiographs, making it the correct choice for assessing different densities in hard-copy images.

What is the main difference between a positive and a negative radiographic image?

• Positive images have dark details on a light background

• Negative images have light details on a dark background

• Positive images are always in color

• Negative images are always in 3D

Answer explanation

The main difference is that positive images display dark details on a light background, while negative images show light details on a dark background. This distinction is crucial in radiography for interpreting images.