Term
Group A
Depth calibration |
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Definition
6 rods that are 20 mm apart in a vertical row.
They evaluate depth calibration, vertical unlinearity, and gain. |
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Term
Group B
Lateral resolution |
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Definition
The rods are located at the bottom and are 20 mm apart.
They evaluate sensitivity, horizontal calibration, and horizontal linearity. |
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Term
Group C
Lateral resolution |
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Definition
| There are 7 rods placed vertically at 25, 20, 15, 10, 5 and 3 mm apart. These rods are scanned from the side and evaluate lateral resolution and beam width. |
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Term
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Definition
| 4 rods placed at 2, 4, 6 and 8 mm depths from the top surface. These rods evaluate the transducer dead zone. |
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Term
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Definition
These rods are located in the center of the test object. The first rod is placed in the center top and the remaining five are placed at 5, 4, 3, 2 and 1 mm with a 15-degree tilt.
The 15-degree angle reduces shadowing and reveberation artifact, allowing the evaluation of axial resolution and registration. |
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Term
| Functions of a test object: |
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Definition
Beam thickness
Accuracy of measured velocities
Penetration |
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Term
| The type of test object that contains gel with small spheres in random positions is the: |
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Definition
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Term
| The type of test object that evaluates sample gate accuracy and registration is the: |
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Definition
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| Quality assurance tests for evaluating the lateral resolution and beam width would utilize the rods in Group: |
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Definition
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Term
| The term used to describe a procedure or test determining that a person does not have disease is: |
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Definition
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Term
The formula for Pasitive predictive value (PV+) is:
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Definition
True Positives
True Positives + False Positives |
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