MR Instruments
The AIRC is home to four research dedicated MR Instruments, three of which are located in the Biomedical Research Building on Marquam Hill. These sophisticated machines support novel research investigating normal physiology, brain development and aging, and disease pathophysiology with high-performance non-invasive imaging capabilities.
To schedule and use any of our instruments, please email the AIRC staff at AIRCLab@ohsu.edu.
Siemens 3T Prisma
The Siemens 3T Tesla Prisma instrument is located in the Lamfrom Biomedical Research Building. The Siemens 3T Tesla Prisma instrument, installed in August 2016, represents a significant upgrade to the AIRC 3T Tim Trio instrument installed in 2006. The gradient set has a Gmax of 80 mT/m and utilizes a force balanced design, which provides a quieter scanning environment. The RF architecture is now fully digital with optical fiber links supporting a total of 64 receiver channels and parallel transmit.
The AIRC Prisma upgrade was possible with funding from the NIH and institutional support.
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Technical information
- Operation at 3T (123 MHz)
- Working Bore Diameter of 60 cm
- Gmax on all three axes of 80 mT/m
- Gradient slew rate
- 64 Receiver Channels allowing simultaneous acquisition of 204 coil elements.
Radio frequency coils
- 16 channel Hand-Wrist
- 64 channel Head-Neck
- 32 channel Head
- TxRx CP Head
- 16 channel Shoulder
- 16 channel Foot-Ankle
- TxRx 15 element Knee
- 32 channel Spine Array
- Two sets of 18 channel body array
- Flex Large Array
- Breast Coil
Accessories
- Medrad Power Injector
- In Vivo Subject Monitoring: ECG, Pulse Oximetry, Respiratory Bellows, et cetera.
- fMRI equipment: Video Projection, Electrostatic Headphones, Fiber Optic Response Boxes, and more.
Siemens 3T Prisma instrument at ONPRC
The Siemens 3T Prisma instrument is located on the campus of the Oregon National Primate Research Center (ONPRC; 10 miles west of OHSU's main Marquam Hill campus) in a dedicated 2500 ft2 building that includes animal preparation areas and offices. The radio frequency (RF) transmitter unit contains one 35 kW narrowband (1H) RF transmitter and one 8 kW broadband RF transmitter capable of producing 20‑128 MHz. The instrument is equipped with a SONATA gradient coil set and a CASCADE gradient amplifier (2000V/500A onall three axes). Together they are capable of producing field gradients of ≥40 mT/m, with a slew rate of ≥200 T/(m*s), on all axes.
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Technical information
- Field Strength/1H Frequency: 3 Tesla (T)/123 MHz
- Clear bore/Working bore: 90 cm/60 cm
- Gradient Strength/Slew Rate: ≥40 mT/m/ ≥200 T/(m*s)
- Receiver channels: 8
- Length/Weight: 2.1m/10 tons
Radio frequency coils
This instrument is equipped with a whole-body RF coil, two 8-channel phased array RF coils (123 MHz, receive only, 24 cm ID, 12 cm ID), a dual-tune 1H (123 MHz)/31P (50 MHz; 16 cm ID) transmit/receive quadrature RF coil.
Accessories
- In Vivo Precess monitor
- Ventilator
Siemens MAGNETOM 7T instrument
The Siemens MAGNETOM 7T instrument is located in the Lamfrom Biomedical Research Building. The RF transmitter unit contains two independent digital RF transmitter channels, each capable of producing pulses with fully digital 1 MHz bandwidth, 32 bit frequency resolution, ≥16 bit phase resolution, and ≤50 ns time resolution. Eight solid-state RF power amplifiers are included, each capable of producing ≥1 kW over 270-305 MHz. If combined into one channel, these can produce ≥7 kW. This configuration also supports B1 shimming when transmit phases and amplitudes are controlled independently and delivered to the phased array head coil. A second RF amplifier is broadband capable (40-305 MHz) with a single 7 kW output. The AVANTO gradient coil set (2000V/625A) is capable of producing field gradients of ≥45 mT/m, with high slew rates ≥200 T/(m*s).
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Technical information
- Field Strength/1H Frequency: 7 Tesla (T)/298 MHz
- Clear bore/Working bore: 90 cm/60 cm
- Gradient Strength/Slew Rate: ≥45 mT/m/ ≥200 T/(m*s)
- Receiver channels: 32
- Length/Mass: 3.7m/30 tons (490 tons with iron shield)
Radio frequency coils
The 7T MRI is equipped with two transmit/receive quadrature 1H (300 MHz) RF coils [one suitable for human head studies, the other for extremity studies], an 8-channel phased-array transmit/receive 1H (300 MHz) head RF coil, and a 31P (121 MHz) transmit/receive quadrature head RF coil.
Accessories
- LCD video projection system for visual fMRI studies
- Auditory system
- Medrad power injector
Bruker Tesla 11.75T instrument
The Bruker Tesla 11.75T instrument is located in the Lamfrom Biomedical Research Building. The 11.75 Tesla (T) horizontal magnet has a clear bore diameter of 31 cm and the ID of the large gradient set is 20 cm. Higher gradient strengths and faster slew rates are available from a gradient insert that has an 9 cm ID. The RF transmitter unit contains two broadband frequency synthesizers and two digital RF transmitters capable of producing 180-600 MHz and 6‑365 MHz pulses, respectively, with each amplifier capable of ≥1 kW peak power. This instrument is equipped with a Resonance Research, Inc high-bandwidth shim power supply for demanding quantitative imaging and spectroscopy studies.
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Technical information
- Field Strength/1H Frequency: 11.75 Tesla (T)/500 MHz
- Clear bore/Working bore [insert]: 31 cm/20 cm [9 cm]
- Gradient Strength/Slew Rate [20 cm insert]: ≥200 mT/m/ ≥1000 T/(m*s)
- Gradient Strength/Slew Rate [9 cm insert]: ≥750 mT/m/≥7500 T/(m*s)
- Transmit channels: 2
- Receiver channels: 2
- Length/Mass: 2.5m/12 tons (60 tons with iron shield)
Radio frequency coils
The system is equipped with two actively RF-decoupled 1H volume resonators with ID/OD of 7.2/8.9 cm and 15.4/19.7 cm, respectively, a 1H 2 cm diameter surface receiver coil, and a 1H/31P double-tuned mini surface coil.
Accessories
- SA Instruments Inc animal monitoring and gating system (model 1025)
- Ventilator (model CWE)
- Gas anesthesia