Development of multi-purpose 3D printed phantoms for MRI.

Development of multi-purpose 3D printed phantoms for MRI.
Phys Med Biol. 2019 Feb 28;:
Authors: Rai R, Wang YF, Manton D, Dong B, Deshpande S, Liney GP
Abstract
This work describes the development and application of 3D printed MRI phantoms. Unlike traditional phantoms these test objects are made from solid materials which can be imaged directly without filling. The models were manufactured using both MRI visible and invisible materials. The MRI visible materials were imaged on a 3T system to quantify their T1 and T2 properties and CT to quantify the electron density. Three phantoms are described: A distortion phantom was imaged on an open bore MRI system to assess distortion over a 30 cm field-of-view; A solid tumour model was imaged using a motion simulator and compared to a standard water phantom to assess reduction in artefacts; Finally, a test object created for textural analysis was evaluated on two 3T systems and reproducibility was assessed.
 Material 1 was the main material used in all phantom models and has a T1 and T2 of 152.3 ± 3.7 ms and 56.7 ± 2.5 ms and a CT density of 127.9 HU. Material 2 had a CT of 115.1 HU and material 3 had a T1 and T2 of 149.5 ± 2.9 ms and 68.8 ± 7.8 ms and CT density of 15.3 HU. Image tests demonstrated the suitability and advantage of each phantom over more traditional versions: A high density of control points enabled a comprehensive measurement of geometric accuracy; sufficient sig...

Source: Physics in Medicine and Biology - February 27, 2019 Category: Physics Authors: Rai R, Wang YF, Manton D, Dong B, Deshpande S, Liney GP Tags: Phys Med Biol Source Type: research