ATS 570 Gebruiksaanwijzing - Pagina 7

Blader online of download pdf Gebruiksaanwijzing voor {categorie_naam} ATS 570. ATS 570 13 pagina's. Multipurpose - endoscopic phantom

1. Scan the phantom until the dead zone target group is clearly displayed. Freeze this image.

2. This group is composed of 9 line targets. The first target is positioned 2 mm below the scan surface.

Subsequent targets are spaced 1 mm apart, to a depth of 10 mm.

3. Using the electronic calipers, measure the distance between the first target imaged and the echo produced by

the scan surface. The resulting value will be the depth of the dead zone.

4. Document the depth measurement on the quality assurance record.

Results

The system's dead zone should remain consistent from week to week when using the same instrument settings

and Model 570 phantom. Compare the test results obtained from the baseline records. If the current image

demonstrates changes in the system's ability to resolve these targets, corrective action should be considered.

VERTICAL MEASUREMENT CALIBRATION (B1 & B2)

Description and Reason For Testing

Vertical distance measurements are obtained along the axis of the sound beam. Accurate representation of the

size, depth and volume of a structure is a critical factor in a proper diagnosis. Most imaging systems use depth

markers and/or electronic calipers to obtain these measurements. The phantom is scanned and a distance

measurement obtained using the timing markers and/or electronic calipers. The resulting measurement is then

compared to the known distance between the line targets in the phantom. The accuracy of vertical distance

measurements depends on the integrity of the timing circuitry of the imaging system.

Testing Procedure

1. Position the transducer over the vertical group of line targets until a clear image is obtained. Freeze the

display.

2. Using the electronic calipers or the timing markers measure the greatest distance that can be clearly imaged

between line targets.

3. Document the measurement obtained on the quality assurance record.

Results

The system's vertical distances measurements should remain consistent from week to week when using the same

instrument settings and Model 570 phantom. Compare the test results obtained from the baseline records. If the

current image demonstrates changes in the system's ability to resolve these targets, corrective action should be

considered.

Linear Horizontal Group (C1 & C2)

Sector Horizontal Group (D1 & D2)

Description and Reason For Testing

Horizontal distance measurements are obtained perpendicular to the axis of the sound beam. Proper diagnosis

depends on the accurate representation of the size and volume of a structure being examined. Most imaging

systems use distance markers and/or electronic calipers to obtain these measurements. The phantom is scanned

and a distance measurement obtained. The resulting measurement is then compared to the known distance in the

phantom. The accuracy of the horizontal distance measurements depends on the integrity of the transducer

scanning assembly, the output intensity and the resolution of the imaging system.

Testing Procedure

Note: The Model 570 General & Small Parts phantom provides two scanning surfaces used to evaluate horizontal

measurement calibration. Due to the geometry and variety of sector scan transducers a separate set of horizontal

line targets are provided to evaluate lateral resolution. Please refer to the specification page for the location of

these groups.