ATS 532B Manuel - Page 2

Parcourez en ligne ou téléchargez le pdf Manuel pour {nom_de_la_catégorie} ATS 532B. ATS 532B 7 pages. Contrast resolution phantom

INTRODUCTION

Quality assurance tissue-mimicking phantoms are used to evaluate the accuracy and

performance of ultrasound imaging systems. The phantoms mimic the acoustic properties of

human tissue and provide test structures within the simulated environment. They are essential

to detect the performance changes that occur through normal aging and deterioration of system

components. Routine equipment performance monitoring can reduce the number of repeat

examinations, the duration of examinations and maintenance time.

This phantom is constructed of a rubber-based tissue-mimicking material. This material extends

the useful life of the phantom by avoiding problems due to melting, freezing, dehydration and

breakage from dropping which are common with hydrogel (water-based) phantoms. By

eliminating these problems, the durability, quality and reliability of this product is guaranteed for

three years.

The acoustic properties of all biologic and non-biologic materials are affected by temperature

variations. Most diagnostic imaging systems and tissue-mimicking phantoms are calibrated at

room temperature, commonly referred to as 23°C. To ensure measurement accuracy ATS

incorporates a thermometer strip affixed to the outside surface of the phantom.

The sound velocity of most diagnostic imaging systems is calibrated to 1,540 meters per second

(mps), the assumed average velocity of sound through human soft tissue. The rubber-based

tissue-mimicking material has a sound velocity of 1450 and 1473 mps at 0.5dB/cm/Mhz and

0.7dB/cm/Mhz respectively at room temperature (23°C).

PRODUCT DESCRIPTION

The Models 532A and 532B Contrast Resolution phantoms are composed of a rubber-based

tissue-mimicking material. The Contrast Resolution phantoms are designed evaluated an

imaging system's gray scale processing and displayed dynamic range. Both models provide

three target sizes at eight levels of contrast, ranging from -12 to +12 dB/cm/MHz relative to the

background material.

The difference between the models is the target size. The Model 532A contains 2.0, 4.0 and 8.0

mm diameter cylindrical targets. Whereas, the Model 532B contains cylindrical targets of 5.0,

10.0, 20.0 mm.

· Functional Resolution

· Definition and fill-in

· Gray Scale

· Displayed Dynamic Range