SU-E-I-69: Magnetic Resonance Metal Artifact Evaluation with Routine Clinical Cardiac Sequences

Medical Physics
D JoynerJ James

Abstract

To examine schemes to grade the severity of metal susceptibility artifacts on image quality using cardiac MRI pulse sequences. A post-thoracotomy patient was simulated with a stainless steel sternal wire (Syneture,MA; size=6, diameter=48mm), placed securely on an ACR MRI phantom. Phantom was scanned on a 1.5-T Siemens using cardiac MRI sequences:1)TrueFISP, 2)Gradient-Recalled-Echo (GRE), 3)Turbo-Spin- Echo (TSE), 4)Turbo-Inversion-Recovery-Magnitude (TIRM), 5)Dark- blood-IR-FS (DBFS) with and without the wire (FOV=30×30cm, slice- thickness/slice-gap=7.0/1.5mm, matrix size=192×192, slices=17). Image quality degradation was assessed in terms of signal loss and spatial deformation; signal loss by a) measuring the largest diameter of signal drop and b) number of slices with a signal drop and spatial deformation in VelocityAI (Atlanta,GA) by computing the rigid transformation indices between the phantom's internal grid with and without the metal. Image quality was evaluated in terms of signal loss, spatial deformation and ring artifacts. Signal loss: TruFISP and GRE showed the largest signal drop diameter (13 and 16cm respectively). GRE sequence showed a signal drop in -12 slices where as signal drop occurred in only ∼4-5 slices wi...Continue Reading

Related Concepts

Related Feeds

Auditory Perception

Auditory perception is the ability to receive and interpret information attained by the ears. Here is the latest research on factors and underlying mechanisms that influence auditory perception.

Related Papers

Veterinary Radiology & Ultrasound : the Official Journal of the American College of Veterinary Radiology and the International Veterinary Radiology Association
James Sutherland-Smith, Brenda Tilley
Veterinary Radiology & Ultrasound : the Official Journal of the American College of Veterinary Radiology and the International Veterinary Radiology Association
Carolina I Urraca del JuncoTobias Schwarz
Veterinary Radiology & Ultrasound : the Official Journal of the American College of Veterinary Radiology and the International Veterinary Radiology Association
Paula Martín-VaqueroSteffen Sammet
© 2022 Meta ULC. All rights reserved