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試験装置 Gammex 403 LEのPDF ユーザーマニュアルをオンラインで閲覧またはダウンロードできます。Gammex 403 LE 20 ページ。 Precision multi-purpose phantoms

Move the transducer across the scanning surface while observing the locations of

the targets.

Notice how the smooth texture of the tissue mimicking gel emphasizes image

non-uniformities and artifacts, making them easier to detect. Scanning an area

without targets is a good way to test for image uniformity.

Decrease gain controls to highlight pin targets.

Scan the vertical pin targets and freeze the image. Use the electronic calipers to

measure the distance between two of the vertical pin targets. Repeat for two of

the horizontal pin targets. The vertical pins have 2 cm spacing while the

horizontal pins have 3 cm spacing.

Use the pin targets to determine vertical distance accuracy and horizontal

distance accuracy. Note that the highest dead zone pin you can see should be

the point of reference not the scanning surface.

Freeze an image of the vertical pin targets. Use the electronic calipers to

measure the horizontal width of the pin targets in the near, mid and far fields of

the image.

Notice how the pin targets are narrowest in the focal zone. The pin width

demonstrates the width of the ultrasound beam at that depth and approximates

the lateral resolution of the scanner.

Measure pin width

to get lateral

resolution.

Pin targets are

narrowest in the

focal zone.