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MR1 - Philips dStream Achieva 3T

MR1 is a Philips dStream Achieva 3T TX scanner. The August-September 2018 upgrade replaced all components except the magnet and gradient coils. It is currently running Release 5.4.0 software. The first MR1 3T scanner was installed in August 2008. It replaced the original Kirby Center 1.5T scanner installed in 1999.

Super-conducting Magnet

The Achieva 3T features an ultra-compact, actively shielded, super-conducting magnet with large 50cm FOV capabilities. The magnet system includes:

  • Ultra compact patient friendly design - only 1.57 m (5.15 ft) in length, ultra short 60cm tunnel length.
  • Large FOV capabilities up to 50 cm.
  • High intrinsic homogeneity combined with dynamic 1st and 2nd order shimming ensures image quality over the full imaging FOV.
  • A lightweight design of 4,600 kg (10141 lbs), a compact fringe field footprint of 3.1m x 5.0m (10ft.2in. x 16ft.5in.) and superconducting main field compensation that reduces susceptibility to field changes induced by moving ferrous objects.
  • 3T zero boil-off technology for zero helium consumption under regular scanning conditions.
  • Patient opening has a 110 cm (43 inch) flare.
  • Patient bore diameter is 60 cm (23.6 inch), length 60 cm
  • Patient support - weight up to 250 kg (550 lbs).
  • Patient table can be lowered to a height of 52 cm (20.4 inch).
  • Horizontal travel of 215 cm (7.05 ft) with ± 1.0 mm (0.04 inch) accuracy.
  • Table speeds of 20 mm/s to 180 mm/s.
  • Adjustable fresh air supply and variable lighting.
  • In-bore microphone and ceiling-mounted loudspeakers support bi-directional patient-operator communication.
  • Hand-held nurse call button.
  • Patient headset with built-in two-way communication reduces acoustic noise by as much as 25 dB.
  • Wireless physiological synchronization for sequence triggering and gating is possible with the standard hardware:
    • Peripheral Pulse
    • Respiratory
    • VCG
  • Physiological signals can be observed on the operator's console monitor.
  • Exam room display for physiology monitoring on the gantry.

Quasar Dual gradient system

The Quasar Dual gradient system enables choise of two amplitude/slew rate combinations. The gradient system design is force-balanced that minimizes vibration levels and acoustic noise.

  • Dual mode gradient performance: peak amplitude 40 mT/m, slew rate 200 mT/m/ms or peak amplitude 80 mT/m, slew rate 100 mT/m/ms. All specifications are on axis (x, y and z).
  • High linearity actively shielded gradient coil designed to minimize eddy currents and acoustic noise, and to provide accurate spatial encoding over a large 50cm whole body field of view.
  • Water-cooled gradient amplifier technology combined with a non-resonant coil design, allows generation of any type of gradient waveform with 100% duty cycle.
  • High Order shimming capabilities, first (x,y,z) and second order (x2-y2, z2, xy, xz, yz) for patient-specific shimming.
  • SofTone reduces gradient acoustic noise by up to 30 dB (an 86% reduction in patient perceived acoustic noise).

DirectDigital RF system

  • Samples the MR signal directly in the RF coil
  • Real-time control of RF transmission, gradient switching, data acquisition and triggering.
  • 18 kW Solid-state RF power amplifier
  • Quadrature Transmit/Receive integrated body coil
  • 32 channel SENSE Head coil.
  • 16 channel SENSE Breast coil.
  • 16 channel SENSE Knee coil.
  • Posterior coil built into table top
  • 2 element Flex S coil, 17 cm elements.
  • 2 element Flex L coil, 17 cm elements.

MR2 - Philips dStream Ingenia Elition 3T

MR2 is a Philips dStream Ingenia Elition 3T scanner. The August 2017-January 2018 upgrade replaced the entire existing scanner. It is currently running Release 5.4.0 software. The original MR2 3T scanner was installed in February 2002. It was the first Philips 3T MRI system installed outside the Philips factory.

This system will be upgraded again in February 2019 with advanced gradient coils that can operate at 100 mT/m (expected).

Specifications provided by Philips:

dStream architecture

Unique digital broadband MR architecture capturing the purest MR signal combined with enhanced workflow and ease of use to provide increased SNR and greater efficiency in your daily operations. In addition the number of channels is no longer determined by the MR system. Up to 40% greater signal-to-noise ratio (DirectDigital)

Xtend design

System design optimized to provide a 70cm wide bore. Magnet, gradient and system body coil designs provide a 55 cm FOV.

Magnet system

  • Actively shielded, lightweight design (<4940 kg) and compact fringe field (3.1 x 5.0 m)
  • Ultra compact magnet design - only 1.62m in length
  • Magnet homogeneity 1.8 ppm / 50 x 50 x 45 cm V-RMS for excellent image quality, off-center imaging and fat suppression.
  • Superconducting screening coils to reduce magnetic field susceptibility caused by moving external ferrous objects.
  • HeliumSave zero boil-off technology for zero helium consumption (0 l/hr).

Gradient system - Omega HP Gradients

  • Peak amplitude up to 45 mT/m (78 mT/m effective), peak slew rate up to 200 mT/m/ms (346 mT/m/ms effective). All specifications are on axis (x, y and z).
  • Superb linearity (< 1.4% over 50 cm FOV) to improve geometric and diffusion accuracy, and to maximize resolution, even at the edges of the field-of-view.
  • High order shimming capabilities: first (x, y, z) and second order (x2-y2, z2, xy, xz, yz) for improved patient-specific shimming.
  • State-of-the-art water-cooled gradient coil and solid-state amplifier for high fidelity and 100% duty cycle.
  • Extremely low eddy currents for short echo times

RF receive: Direct Digital and EasyExpand

DirectDigital: Unique Philips technology that samples the MR signal directly in the RF coil on the patient. The fiber-optic transmission of digital broadband data from the coil to the image reconstructor removes potential noise influences typical with analog pathways.

  • Capturing the purest MR signal with up to 40% greater signal-to-noise, enabling higher speed/resolution
  • Increased dynamic range (max 187 dB)

DirectDigital technology additionally includes:

  • Sub-millisecond TRs and ultra-short TEs
  • Real-time imaging control for clinical motion correction:
  • navigator-corrections required for free-breathing cardiac techniques
  • high-resolution diffusion (i.e., PhaseTrak) with profile updates within 1 ms.
  • Real-time control of RF transmission, gradient switching, data acquisition and triggering.

EasyExpand: Inherent design of the dStream architecture, where channels are determined by the coils rather than the system. The MR system becomes channel independent, which means a removal of the number of channels as a system specification. This enables plug-and-play expansion of clinical capabilities. Expansion does not require major system upgrades.

dS-SENSE

Next generation parallel imaging for the dStream (dS) architecture, enables higher parallel imaging factors for more speed or resolution.

  • Includes quick, fully integrated reference scans which are planned automatically. RF Transmit: MultiTransmit 4D Unique RF transmit design using multiple RF sources. MultiTransmit parallel RF transmission enhances signal and image contrast uniformity, speed and consistency at 3.0T for all applications.
  • Patient-adaptive RF matches the RF field to the anatomy of each and every patient.
  • Up to 40% more speed compared to single transmit RF systems.
  • New MultiTransmit 4D enables the RF field to be optimized even during real-time cardiac applications.
  • Parallel RF transmission and reception (2 x 2 channels) using two independent RF sources, amplifiers and receivers enabling patient-adaptive RF shimming: Adjustment of individual RF sources to provide uniform, consistent RF distribution and lower local RF deposition in each individual patient.
  • The independent RF amplifiers feed into the individual ports of the MultiTransmit dS T/R System Body coil
  • Patient-adaptive RF shimming adapts the RF (power, amplitude, phase, waveform) to each patient and each anatomy to maximize RF uniformity, contrast and consistency
  • 2 x 18kW high-performance solid-state RF power amplifiers allow short, complex RF pulses, even on large patients.
  • Digital control loops for each individual (TX) transmit channel digitize the transmit signals close to the System Body coil. These feedback loops ensure outstanding image quality by delivering optimal amplitude, phase and waveform of the RF pulses.
  • RF-SMART technology enables SAR to be effectively managed through balanced system design, and maximizes scanner performance in combination with the application of Philips unique imaging capabilities such as SENSE, SPAIR, Flip Angle Sweep and RF amplitude control.

Standard RF coils

dS T/R System Body coil 3.0T

The integrated dS T/R System Body coil is a transmit/receive system coil which is typically used for RF excitation, but can also be used for imaging various (large) body parts.

  • MultiTransmit solid-state phased-array Transmit/Receive system body coil for improved SAR control and a high signal-to-noise ratio
  • DirectDigital sampling in the coil where the MR signal is at its purest.
  • Channels: 2x2 (Transmit x Receive)
  • Excellent homogeneity
  • 70 cm aperture

dS Head 32ch 3.0T

The dS Head 32ch 3.0T is a 32-channel coil designed for advanced neuro applications including fMRI, Spectroscopy, Angiography. It is also designed to facilitate EEG studies. The coil includes both front and rear facing mirrors for visual stimuli and movie projection. Features:

  • Complete high resolution coverage of the brain
  • Parallel imaging with SENSE in all directions

dS Torso 3.0T

An integrated coil solution for body and peripheral vascular related imaging. It includes the FlexCoverage Anterior coil. Combined with the FlexCoverage Posterior coil it enables 60 cm coverage, with a maximum of 32 channels. The flexible, lightweight easy-to-position FlexCoverage Anterior coil is designed to conform both in right-left and foot-head directions for almost any patient. This enables large coverage and comfortable strap-free operation.

  • Coverage: 60 cm
  • Maximum nr. of channels: 32
  • Main applications: Torso, Chest, Pelvis, Heart, Peripheral-vascular

dS Knee 16ch 3.0T

Coil designed for ultra-high SNR imaging over an extended field of view of the knee and other extremities. The T/R design gives lower RF deposition and shorter RF pulses for increased speed and SNR. Two overlapping rings of eight elements extend the coverage area and minimize the need for precise positioning. dS-SENSE enhanced parallel imaging can be selected in all directions. The dS Knee 16ch has a split design for easy patient setup and an ergonomically ramped insert for patient comfort.

  • Coverage: 20 cm
  • Maximum nr. of channels: 16
  • Main applications: Knee, extremities
  • Coil type: Dedicated, Transmit/Receive

dS Breast 16ch 3.0T

A dedicated breast coil that can be used alone or in combination with FlexTrak Mammo. The coil is designed to deliver highest performance in coverage, image resolution and imaging speed. An adjustable head rest and soft patient ramp are included for patient comfort.

  • Coverage: Bilateral
  • Maximum nr. of channels: 16
  • Main application: Breast

dS Flex L 3.0T

An integrated coil solution for general-purpose imaging. It includes two large flexible general purpose coils. Combined with the FlexCoverage Posterior coil they enable 20 cm coverage, with a maximum of 8 channels. The shape and size of the flexible coil elements enable a wide variety of applications, including imaging of large anatomies. The coil can be used to locally enhance resolution of images acquired over a larger FOV, for example in pediatric applications.

  • Coverage: 20 cm
  • Maximum nr. of channels: 8
  • Main application: Shoulder, Hip, Head, Brachial plexus, Pelvis, Cardiac, Pediatric

dS Flex S 3.0T

An integrated coil solution for general-purpose imaging. It includes two small flexible general purpose coils. Combined with the FlexCoverage Posterior coil they enable 10 cm coverage, with a maximum of 4 channels. The shape and size of the flexible coil elements enable a wide variety of applications, including imaging of small anatomies. The coil can be used to locally enhance resolution of images acquired over a larger FOV, for example in pediatric applications.

  • Coverage: 10 cm
  • Maximum nr. of channels: 4
  • Main applications: Elbows, Wrist, Ankle, Inner ear, Pediatric

For more information please contact the Kirby Center.

Thank you.


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Last Updated 02/22/00; Send email