A 10-mm MR-Conditional Unidirectional Pneumatic Stepper Motor

Author

Yue Chen ; Mershon, Christopher D. ; Tse, Zion Tsz Ho

Author_Institution

Coll. of Eng., Univ. of Georgia, Athens, GA, USA

Volume

20

Issue

2

fYear

2015

fDate

Apr-15

Firstpage

782

Lastpage

788

Abstract

Magnetic resonance (MR) conditional robotic devices facilitate accurate interventional procedures under MR imaging (MRI) guidance. For this purpose, a compact (10-mm diameter) MR-conditional stepper motor is presented. The device features seven key components, which contribute to a dense and easy to fabricate design. Alternating bursts of pressurized air and vacuum can drive the motor in 60° per step to achieve a maximum torque of 2.4 mNm. The relationship between torque and angular speed was investigated to demonstrate motor performance under different loading conditions. The stepper motor was tested in a GE 3T MRI scanner to verify its MR-compatibility. A maximum artifact width of 3 mm was measured in MRI images and a maximum signal-to-noise ratio reduction of 2.49% was recorded.

Keywords

magnetic resonance imaging; stepping motors; GE 3T MRI scanner; MR imaging guidance; MR-conditional unidirectional pneumatic stepper motor; angular speed; magnetic resonance; robotic devices; signal-to-noise ratio; size 10 mm; size 3 mm; torque; Force; Friction; Gears; Magnetic resonance imaging; Materials; Springs; Torque; MR imaging (MRI); Magnetic resonance (MR)-conditional; pneumatic stepper motor;

fLanguage

English

Journal_Title

Mechatronics, IEEE/ASME Transactions on

Publisher

ieee

ISSN

1083-4435

Type

jour

DOI

10.1109/TMECH.2014.2305839

Filename

6754173