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What is PMMA phantom? 

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A PMMA phantom is a type of phantom made from polymethyl methacrylate, also known as acrylic. It is used in various medical imaging and radiation therapy applications. PMMA phantoms are designed to mimic the properties of human tissue and are used to calibrate and test imaging equipment, measure absorbed dose rates, and verify the accuracy of treatment planning systems. They are often used in CT scanning to measure modulation transfer function (MTF) , absorbed dose rate to water and penumbra in Gamma Knife® (GK) , proton energy verification , and proton therapy verification using PET scanning . PMMA phantoms are cost-effective, easy to handle, and provide reliable results for various applications in medical imaging and radiation therapy . They are commonly used in combination with ionization chambers for dosimetry measurements in CT scanning .

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PMMA phantom is a transparent and homogeneous block made of polymethyl methacrylate (PMMA) that is used in particle therapy experiments.
The paper does not provide a direct explanation of what a PMMA phantom is.
The paper does not provide a direct definition of a PMMA phantom.
The paper does not provide a specific definition or explanation of what a PMMA phantom is.

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