Hitachi Airis II Open MRI

Hitachi Airis II MRI with Phased Array

System Highlights:

  • Permanent Open Magnet: 0.3T
  • Software version: 4.5U
  • Date of manufacturing: 1999
  • Options:
    • Phased Array
    • Cardiac Gating
    • MRA
    • Diffusion
    • Fat Suppression
  • Coils:
    • CTL,
    • Head,
    • Extremity,
    • Cervical,
    • Body (Medium)
    • Body (L)
    • Body (XL)
    • Shoulder
    • Neck


The Hitachi Medical Systems America, Inc. Magnetic Resonance Imaging system, AIRIS II, is a high performance, premium open MR scanner. AIRIS II combines a 0.3 Tesla field strength and advanced permanent magnet technology for outstanding image quality. It has an award-winning open gantry design that provides easy access from all four sides and offers the patient a comfortable environment. AIRIS II has an extremely fast and powerful 15 mT/m gradient system for enhancing day-to-day clinical performance and for specialized, emerging technologies. Its digital RF system, both the 4-channel
quadrature transmitter and the Dual QUAD receiver, provides high sensitivity and maximum anatomical coverage. AIRIS II has the extended throughput of a RISC-based, 64-bit UNIX platform workstation and an easy-to-use OpenWindows-based graphical user interface. The system is extremely cost-effective and easy to site in as little as 375 sq.ftThe AIRIS II configuration includes:

  • Open Magnet
  • Gantry and Patient Handling System
  • Gradient System
  • RF System
  • RF Receiver Coil Set.
  • Computer System
  • Operator Console
  • Operating Software
  • Imaging Capabilities
  • Image Processing/Display/Analysis
  • Archive/Interface/Network


The magnet provides excellent performance for whole body imaging. The innovative open design has an appealingly small footprint,

  • Operating field strength: 0.3T
  • Magnetic field orientation: Vertical
  • Homogeneity: +/- 2ppm (FWHM over a 20cm DSV)
  • Shimming: Passive, as well as three axis per-patient
  • Magnet weight: 34,600 lb.
  • Five gauss fringe field: 6.6 feet lateral and 8.2 feet both longitudinal and vertical from the magnet’s center


The gantry design, incorporating a vertical field magnet, provides a spacious appearance and a comfortable environment for the patient during scanning.

  • Magnet opening: 43cm vertical height
  • Off-center post placement for unrestricted access from all four sides
  • Extra-wide (80cm) table with 500 lb. weight capacity
  • Power driven table movement in all three directions; vertical, horizontal and lateral
  • Manual table-top emergency release
  • Laser light localization in three planes for accurate patient positioning
  • Start scan function available at front, sides and rear of magnet gantry
  • Patient intercom
  • Padded table-top


The HITACHI-designed and built gradient system provides sub-millimeter in-plane spatial resolution and thin-slice imaging. The pulse-gradient driver’s state-of-the-art digital electronic technology provides high reliability and efficient operation,

  • Gradient strength: l5 mT/m, maximum
  • Slew rate: 20 T/m/s, maximum
  • Completely air cooled gradients
  • Shielding: Passive, to neutralize the effects of eddy currents
  • Eddy current compensation: 1/10th factor, maximum
  • Soft Sound gradients offer extremely low acoustic noise for added patient comfort


The RF system provides for highly reliable transmission of RF and reception of MR signals. An ultra low-noise pre-amplifier and pre-matched RF coil electronics provide for maximum performance.

  • 4channel QUAD transmitter for uniform excitation
  • 5.0 kw transrnitter power amplifier to accommodate even the largest patients
  • 0.3 dB ultra-low noise pre-amplifier for high SNR
  • Actively decoupled RF receiver Coils
  • Linear and quadrature detection
  • Auto tuning


Open QUAD Head Coil
This spacious quadrature coil design provides high signal-to-noise, which is especially useful for efficient routine brain imaging, as well as high-resolution, thin-slice imaging.

QUAD Extremity Coil
This effective quadrature coil uses a high performance quadrature/solenoid design to provide high signal-to-noise, which is especially useful for high resolution imaging of detailed knee anatomy.

Large Extremity Coil
A high sensitivity design to optimize imaging of shoulders, large knees, thighs and pediatric heads.

Volumetric Neck and Extremity Coil
A high sensitivity solenoid coil for neck and extremity imaging applications. This volumetric coil provides high signal-to-noise and a uniform field of view within the coil’s 20 cm diameter.

Medium QUAD Flexible Spine and Body Notch Coil
This medium spine and body coil (120cm in circumference) combines quadrature RF technology with solenoid coil design for high quality spine and body imaging. The wrap around features offers uniform signal intensity within the selected field-of-view, along with an extended longitudinal coverage for comprehensive lumbar or thoracic spine imaging. Patient comfort and fit is enhanced with the notched, flexible design.

Large QUAD Flexible Spine and Body Notch Coil
This large spine and body coil (150cm in circumference) combines quadrature RP technology with solenoid coil design for high quality spine and body imaging. The wrap around features offers uniform signal intensity within the selected field-of-view, along with an extended longitudinal coverage for comprehensive lumbar or thoracic spine imaging. Patient comfort and fit is enhanced with the notched, flexible design.


The Hitachi designed computer system was developed for use by a single operator. The state-of-the-art performance and graphic user interface (GUI) allows for rapid system operation.

  • Host CPU is a 64 bit, RISC-based UNIX processor
  • 512 Mbytes memory
  • Additional processors for pulse sequence control, data acquisition, image reconstruction and image processing
  • < reconstruction time (256 x 256)
  • Easy-to-useOpenwindows-based GUI
  • Multi-tasking operating environment


The control console provides for straightforward operation through the use of optimized ergonomic component design.

  • 21” high resolution color monitor designed and manufactured by HITACHI
  • Mouse input for rapid interaction
  • Keyboard input for direct alpha-numeric response
  • Control panel for patient intercom and emergency stop


The operating software configuration allows for easy access to all operator functions including scanning, reconstruction.display/analysis, and archiving.

  • Scan Task Card

o Scan protocol selection

o Slice and pre-saturation positioning

o Display of reconstructed images

  • Viewport Tool

Maneuvering of images such as window/level, cine, ROI and measurement

  • 2D Processing Task Card
    Performs 2D post-processing functions including Adaptive Reconstruction and
    edge enhancement
  • 3D Processing Task Card
    Performs 3D post-processing functions including MPR and MIP
  • Analysis Task Card
    Supports quantitative analysis features
  • Maintenance Task Card
    Supports specialized procedures to insure high image quality


The image acquisition software provides multiple slice imaging, with the flexibility of user-selectable imaging parameters.

  • Automatic Per-Patient Prescan
    Set RF power
    Set frequency
    Set receiver gain
    Set receiver tuning
    Perform auto-shim
  • Image Plane Selection
    Transverse, sagittal and coronal
    Single and double oblique angles
    Multiple slice, multiple angle
  • Acquisition Features
    2D multislice with contiguous or gapped slices (up to 256 slices)
    3D single or multiple slabs (up to 32)
    User variable image matrix (64-512 x 64-512)
    Maximum of 4 echoes for multiecho sequences
    20 slice thickness of 2mm -100mm
    3D slice thickness of 0.5mm – 5mm
  • Standard Pulse Sequences
    2D Spin Echo (SE)
    2D Inversion Recovery (IR)
    2D STIR
    2D FLAIR
    2D Gradient Echo (GE)
    2D Dual Slice
    3D Spin Echo (SE)
    3D Inversion Recovery (IR)
    3D Gradient Echo (GE)
  • Steady State Pulse Sequences
    2D PP-Spoiled SARGE (RSSG)
    2D Time-Reversed SARGE (TRSG)
    3D SARGE (SG)
    3D RF-Spoiled SARGE (RSSG)
    3D Time-Reversed SARGE (TRSG)
  • MR Angiography
    2D Time-of-Flight (TOP) 2D TOF with RF Spoiled SARGE (RSSG)
    3D Time-of-Flight (TOF)
    3D TOF with RF Spoiled SARGE (RSSG)
    Sloped Slab Profile (SSP) for reducing through-plane flow saturation
    2D TOF with walking pre-saturation to highlight either arterial or venous flow
    Compatible with:
    Gradient moment nulling for flow compensation
    Overlapping 3D slabs
    Presaturation (up to 6)
    Cardiac gating
    Peripheral pulse gating
    Swap frequency/phase direction
    2D slice thickness of 2mm -1 00mm
    3D slice thickness of 0.5mm – 5mm
    Variable flip angle
    Half echo
    High Resolution/High Definition (HR/HO) reconstruction for increased visualization
    of small vascular structures.
    Maximum Intensity Projection (MIP) processes 2D and 3D acquired images
    to calculate projection images with batch or user defined rotations. Includes
    selective ROI.
  • Fast Spin Echo
    2D Fast Spin Echo (FSE)
    2D Fast Inversion Recovery (FIR)
    3D Fast Spin Echo (P52)
    3D Fast Inversion Recovery (FIR)
    Single contrast (T1, T2 or proton density)
    Dual contrast (T2 and proton density)
    Compatible with:
    Auto bandwidth
    Gradient moment nulling for flow compensation
    User variable image matrix (128-1024 x 128-512)
    2D slice thickness of 2mm -100mm
    3D slice thickness of 0.8mm – 5mm
    Rectangular FOV
    Off-center FOV
    User variable echo factor
    User variable interecho spacing
  • Protocol Enhancements (compatible with various pulse sequences)
    Variable bandwidth
    Auto bandwidth
    No frequency/phase wrap
    Swap frequency/phase direction
    Presaturation (up to 6)
    Rectangular FOV
    Off-center FOV
    Gradient moment nulling for flow compensation
    Cardiac gating
    Peripheral pulse gating
    Variable flip angle
    Half scan
    Half echo


Rapid image handling and precise image manipulation is enabled with the high performance AIRIS II computer system.

  • Image Display

o Display matrix: 1280 x 1024

o Variable window level and width adjustment

o User pre-set window level and width

o Image acquisition annotation

o Multiple image display

o User selectable image layout

o Reverse Image

  • Image Processing

Magnify image

o Rotate image

o Edge enhancement with other post processing algorithms

o Background noise reduction (BNR)

o Cine and multi-image cine

  • Image Analysis

o Distance measure

o Angle measure

o Line profile plot

o Region of interest (ROI)

o Histogram

  • Adaptive Reconstruction
    For enhanced image signal to noise. Adaptive Reconstruction can be programmed
    as part of image acquisition process and is user selectable from a predefined set,
    or can be executed as a 2D post-processing task
  • Maximum Intensity Projection (MIP)
    Processes 2D and 3D acquired images to calculate projection images with batch
    or user defined rotations. Used, for example, with MRCP and MRA.
  • ExpandedMulti-Tasking
    The AIRIS II multi-tasking provides simultaneous scan and reconstruction
    capabilities. This feature increases Throughput during multiple acquisitions by
    eliminating the time interval associated with reconstruction. Other multi-tasking
    features include image review, prescribe ahead scan set-up, archive, filming MPR,
    MP and network transfers (optional).


Integral to the AIRIS II operating system is the support of short and long term archive
and digital interface for filming.

  • Image Archive
    Magnetic disk: 4 GB storage capacity for over 9800 images (256×256)
    Optical disk: 2.6 GB re-writeable storage capacity for over 17,000
    images (256×256)
  • Interface
    Digital output and host control of laser imager

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