Chapter 15-Displays and Image Processing Questions

Which electronic component is required for gray scale imaging?

Scan converter technology is used to create gray scale displays.

What scan converter provides the best spatial resolution?

A scan converter with 1000 x 1000 pixels (1 million picture elements) produces the best spatial resolution.

What is a bit in computer memory?

A bit is the smallest element of computer memory.

How many gray shades can be represented by 4 bits?

4 bits can represent 16 gray shades.

How many gray shades can be represented by 8 bits?

With 8 bits, 256 different gray shades can be stored.

What is DICOM?

DICOM is a set of standards that allow medical imaging systems to communicate over a network.

What is the primary storage device on a PACS system?

Hard disc drives are used as the primary storage device on a PACS system.

Which technique is used to create image data where none exists?

Fill-in interpolation is used to create image data where there are gaps in scan lines.

How are tissues deformed in modern elastography?

Tissues are automatically deformed by the sound beam itself.

What is the primary disadvantage of video tape image archiving?

The information is vulnerable to erasure when exposed to strong magnetic fields.

Where does coded excitation take place?

Coded excitation takes place in the pulser.

Which advantage is not true about PACS systems?

Images have higher resolution than what appears on the system's display simply with the use of a PACS system.

Which electronic component is required for gray scale imaging?

• A. VCR
• B. Scan converter
• C. Transducer
• D. Receiver

B. Scan converter technology is used to create gray scale displays.

What scan converter provides the best spatial resolution?

• A. 256 \times 256 pixels
• B. 512 \times 512 pixels
• C. 128 \times 128 pixels
• D. 1000 \times 1000 pixels

D. A scan converter with 1000 \times 1000 pixels (1 million picture elements) produces the best spatial resolution.

What is a bit in computer memory?

• A. The smallest element of computer memory
• B. A group of 8 bytes
• C. A component of the pulser
• D. The largest unit of storage

A. A bit is the smallest element of computer memory.

How many gray shades can be represented by 4 bits?

• A. 4
• B. 8
• C. 16
• D. 32

C. 16. 4 bits can represent 2^{4} = 16 gray shades.

How many gray shades can be represented by 8 bits?

• A. 8
• B. 64
• C. 128
• D. 256

D. 256. With 8 bits, 2^{8} = 256 different gray shades can be stored.

What is DICOM?

• A. A hardware storage device
• B. Protocols for medical imaging networking
• C. A type of transducer
• D. A method for coded excitation

B. DICOM is a set of standards that allow medical imaging systems to communicate over a network.

What is the primary storage device on a PACS system?

• A. Magneto-optical disc
• B. Hard disc drives
• C. DVD
• D. USB Flash drive

B. Hard disc drives are used as the primary storage device on a PACS system.

Which technique is used to create image data where none exists?

• A. Edge enhancement
• B. Temporal resolution
• C. Fill-in interpolation
• D. Spatial compounding

C. Fill-in interpolation is used to create image data where there are gaps in scan lines.

How are tissues deformed in modern elastography?

• A. Manual compression by the technician
• B. Patient breathing maneuvers
• C. Automatically by the sound beam itself
• D. Gravity and patient positioning

C. Tissues are automatically deformed by the sound beam itself.

What is the primary disadvantage of video tape image archiving?

• A. It is too expensive
• B. It requires high power consumption
• C. It is vulnerable to erasure by strong magnetic fields
• D. It has low storage capacity

C. The information is vulnerable to erasure when exposed to strong magnetic fields.

Where does coded excitation take place?

• A. In the receiver
• B. In the memory
• C. In the pulser
• D. In the scan converter

C. Coded excitation takes place in the pulser.

Which advantage is not true about PACS systems?

• A. Rapid access to archived studies
• B. No degradation of data over time
• C. Ability to transmit images to remote locations
• D. Images have higher resolution than what appears on the system display

D. Images have higher resolution than what appears on the system's display. Images do not gain resolution simply by being stored in a PACS system.