Four-Dimensional Imaging Can Be Done Only with

question 9

Multiple Choice

Four-dimensional imaging can be done only with

• A) existing ultrasound systems with a 3D option.
• B) 3D systems that use electromagnetic positioning sensors.
• C) dedicated 3D transducers.
• D) offline systems that attach to the ultrasound transducer.

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Definitions:

Cyclic AMP

A secondary messenger important in many biological processes, formed from ATP by the action of adenylyl cyclase.

Second Messenger

A substance (e.g., cyclic AMP or calcium ions) that relays a message from a signaling molecule (the first messenger) bound to a cell-surface receptor; leads to some change in the cell.

Protein Kinase A

An enzyme that transfers phosphate groups from ATP to specific proteins, playing a key role in the regulation of cellular processes.

Tyrosine Kinases

A family of enzymes that catalyze the transfer of a phosphate group from ATP to a tyrosine residue in a protein, playing key roles in signal transduction pathways.