A Simple, robust hardware device for passive or active respiratory gating in MRI and MRS experiments

Joel R. Garbow, Joseph P. Dugas, Sheng Kwei Song, Mark S. Conradi

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

The synchronization of MR data collection with respiration is essential for collecting high-quality, in vivo magnetic resonance images and spectra of rodents. In this article, we describe the design and operation of a simple, robust device for respiratory gating. Inexpensive and easy to construct, the device operates in either free-breathing or actively driven (ventilator) modes. Respiration is monitored either by a pressure transducer connected to the nosecone used to deliver anesthesia to the animal or by a fiber-optic detector of the animal's motion. The device generates a TTL signal that can be used to trigger the MR scanner to enable respiratory-synchronized data acquisition. A variety of different MR imaging sequences can be easily modified to incorporate respiratory gating. We present respiratory-synchronized imaging and spectroscopy results obtained using this device, including 1H MR images of mouse lung, liver, and spinal cord and localized 1H spectra of mouse liver.

Original languageEnglish
Pages (from-to)40-48
Number of pages9
JournalConcepts in Magnetic Resonance Part B: Magnetic Resonance Engineering
Volume21
Issue number1
DOIs
StatePublished - Apr 1 2004

Keywords

  • Hardware
  • Respiratory gating
  • Small-animal MRI
  • Ventilator

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