The TREX MRI system produces cross-sectional images: Anatomical Region: General body anatomy, including head, spine, forso, and extremities 1H nuclei (Proton) Nucleus excited: . Images correspond to the distribution of 1H nuclei exhibiting Diagnostic uses: . nuclear magnetic resonance, with image intensity dependent upon NMR parameters, including spin-lattice relaxation time (T1) spin-spin relaxation time (T2) density of nuclei (p) flow velocity chemical shift (δ) lmages may be interpreted by a trained physician to yield Clinical use: . information that can be useful in the determination of a diagnosis.
Device Story
TREX MRI (formerly IMiG-MRI) is a 0.15T magnetic resonance diagnostic device. System utilizes RF coils (Head, C-Spine, Knee) to capture 1H nuclei signals; transforms signals into cross-sectional images based on T1, T2, proton density, flow velocity, and chemical shift. Operated by trained clinicians in stationary clinical settings. Output consists of diagnostic images interpreted by physicians to assist in clinical diagnosis. Device enhancements include quadrature Head and C-Spine coils and a linear Knee coil to improve SNR and coil fill factor. System supports multiple acquisition sequences: Spin Echo, Gradient Echo, Fast Spin Echo, Fast Dual Echo, 3D Fast Gradient Echo, and Inversion Recovery. No software revisions required for coil integration.
Clinical Evidence
Bench testing only. Performance parameters provided for the new RF coils, including SNR (>34.2 for Head coil), uniformity (<14% for Head coil), and geometric distortion (<2.5% for Head coil). No clinical data presented.
Technological Characteristics
0.15T static magnetic field; 18.4 T/sec max field change; 0.05W/kg RF power deposition. RF coils: quadrature Head (19cm diameter), quadrature C-Spine, linear Knee. Imaging sequences: Spin Echo, Gradient Echo, Fast Spin Echo, Fast Dual Echo, 3D Fast Gradient Echo, Inversion Recovery (STIR, FLAIR).
Indications for Use
Indicated for patients requiring cross-sectional imaging of general body anatomy, including head, spine, torso, and extremities, using 1H nuclei nuclear magnetic resonance parameters (T1, T2, density, flow, chemical shift) for diagnostic purposes.
Regulatory Classification
Identification
A magnetic resonance diagnostic device is intended for general diagnostic use to present images which reflect the spatial distribution and/or magnetic resonance spectra which reflect frequency and distribution of nuclei exhibiting nuclear magnetic resonance. Other physical parameters derived from the images and/or spectra may also be produced. The device includes hydrogen-1 (proton) imaging, sodium-23 imaging, hydrogen-1 spectroscopy, phosphorus-31 spectroscopy, and chemical shift imaging (preserving simultaneous frequency and spatial information).
Special Controls
*Classification.* Class II (special controls). A magnetic resonance imaging disposable kit intended for use with a magnetic resonance diagnostic device only is exempt from the premarket notification procedures in subpart E of part 807 of this chapter subject to the limitations in § 892.9.
{0}------------------------------------------------
# Attachment 1 510(k) Summary of Safety and Effectiveness
Back to Table of Contents
{1}------------------------------------------------
#### SUBMITTER INFORMATION: 1.0
- Field Effects, a division of Intermagnetics General Corporation 1.1 · Submitter: 300 Vesper Executive Park Tynasborough, MA 01879 PH: 978 649-8590 FX: 978 649-8520 Email: GHURST@IGC.com
- Grea Hurst, Ph.D. 1.2 Contact: Mgr., Imaging Science and Applications
- June 10, 1998 1.3 Date:
- Regulatory Counsel: 1.4 Jonathan S. Kahan, Attorney at Law Hoaan & Hartson 555 Thirteenth St. NW Washington, DC 20004-1109 PH: 202 637-5794 FX: 202 637-5910
#### DEVICE NAME: 2.0
- Radiology Classification Panel: 2.1
- 892.1000 Maanetic Resonance Diagnostic Device Classification Number: 2.2
- System, Nuclear Magnetic Resonance Imaging 2.3 Product Nomenclature:
- Product Code(s): 90LNH 2.4
- 90MOS (Maanetic Resonance Specialty Coil)
- 2.5 Trade/Proprietary Name: TREX MRI
- IMiG-MRI 2.6 Predicate Device:
#### DEVICE DESCRIPTION: 3.0
#### 3.1 FUNCTION
Identical to the IMiG-MRI 510(k) K963953. As a result of newly created business arrangements, the original IMiG-MRI system will now be renamed as TREX MRI. With the exception of the device modifications identified in this 510(k) submission, and the renaming of the product, the TREX MRI is identical to the original IMiG-MRI system.
The TREX MRI 0.15T Elliptical MRI Magnetic Resonance Diagnostic Device is being enhanced by three additional RF Coils (Head Coil [quadrature], C-Spine Coil [quadrature], and Knee Coil [linear]) to increase the clinical utility of the TREX MRI in the stationary configuration.
The new quadrature Head Coil (Field Effects P/N 96530-01) will have a smaller diameter of 19 cm. The reduction in diameter will allow for improved coil fill factor, increasing SNR, while maintaining optimal coil uniformity. This new coil will replace the original Head Coil.
{2}------------------------------------------------
The new C-Spine Coil Field Effects P/N 96529-01) is substantially re-designed from the original coil, optimized for Cervical Spine imaging, and reducing the potential for patient anxiety and claustrophobia. This new coil utilizes a proprietary multiple receiver coil design, and will replace the original C-Spine/Knee Special Purpose Coil.
The new Knee Coil (Field Effects P/N 96629-01) utilizes a proprietary solenoid receiver coil design optimized for knee and extremity anatomies, improving coil fill factor, and increased S/N Ratio.
TREX MRI software did not need to be revised in order to support full functionality of these coils.
#### 3.2 Safety Parameter Summary
| Maximum static magnetic field | 0.15 Tesla |
|------------------------------------------|---------------------------------|
| Maximum rate of magnetic field<br>change | 18.4 Tesla/sec |
| Maximum RF power deposition | 0.05W/kg |
| Acoustic noise levels | 114dB peak; 95dB A-weighted RMS |
#### 3.3 Performance Parameter Summary
| Receiver Coil | Head | Body |
|----------------------|------------------------------------------|----------|
| Specification Volume | 15cm dsv | 30cm dsv |
| SNR | > 34.2 | > 33.1 |
| Uniformity | < 14% | < 40% |
| Geometric Distortion | < 2.5% | < 3.5% |
| Slice Thickness | within 10% of nominally designated value | |
| Slice Position | within 10% of nominally designated value | |
| Spatial resolution | nominally equivalent to pixel size | |
#### General Safety and Effectiveness Summary 3.4
Safe and effective use of the machine is assured by associated labeling. This labeling includes: advertising brochures, Site Planning Guide, and Instructions for Use (comprised of Clinical Users Guide, User Safety Guide, User Training Guide, User Applications Guide, and User QA & Maintenance Guide).
{3}------------------------------------------------
#### DEVICE INTENDED USE: 4.0
The TREX MRI system produces cross-sectional images:
diaqnosis
- · Anatomical Region: General body anatomy, including head, spine, forso, and extremities
- 1H nuclei (Proton) Nucleus excited: .
- Images correspond to the distribution of 1H nuclei exhibiting Diagnostic uses: . nuclear magnetic resonance, with image intensity dependent upon NMR parameters, including spin-lattice relaxation time (T1) spin-spin relaxation time (T2) density of nuclei (p) flow velocity chemical shift (δ) lmages may be interpreted by a trained physician to yield Clinical use: . information that can be useful in the determination of a
### DEVICE TECHNOLOGICAL CHARACTERISTICS: 5.0
Identical to the Predicate Device.
{4}------------------------------------------------
Image /page/4/Picture/2 description: The image shows the address of the Food and Drug Administration. The address is 9200 Corporate Boulevard, Rockville MD 20850. The text is black and the background is white.
SEP
2 1998
Greg Hurst, Ph.D. Mgr., Imaging Science and Applications Field Effects, A Division of Intermagnetics General Corp. 300 Vesper Executive Park Tyngsborough, Massachusetts 01879
Re:
K982157
TREX Magnetic Resonance Diagnostic Device Dated: June 10, 1998 Received: June 19, 1998 Regulatory Class: II 21 CFR 892.1000/Procode: 90 LNH
Dear Dr. Hurst:
We have reviewed your Section 510(k) notification of intent to market the device referenced above and we have determined the device is substantially equivalent (for the indications for use stated in the enclosure) to devices marketed in interstate commerce prior to May 28, 1976, the enactment date of the Medical Device Amendments, or to devices that have been reclassified in accordance with the provisions of the Federal Food, Drug, and Cosmetic Act (Act). You may, therefore, market the device, subject to the general controls provisions of the Act. The general controls provisions of the Act include requirements for annual registration, listing of devices, good manufacturing practice, labeling, against misbranding and adulteration.
If your device is classified (see above) into either class II (Special Controls) or class III (Premarket Approval), it may be subject to such additional controls. Existing major regulations affecting your device can be found in the Code of Federal Regulations, Title 21, Parts 800 to 895. A substantially equivalent determination assumes compliance with the Current Good Manufacturing Practice requirements, as set forth in the Quality System Regulation (OS) for Medical Devices: General regulation (21 CFR Part 820) and that, through periodic QS inspections, the Food and Drug Administration (FDA) will verify such assumptions. Failure to comply with the GMP regulation may result in regulatory action. In addition, FDA may publish further announcements concerning your device in the Federal Register. Please note: this response to your premarket notification submission does not affect any obligation you might have under sections 542 of the Act for devices under the Electronic Product Radiation Control provisions, or other Federal laws or regulations.
This letter will allow you to begin marketing your device as described in your 510(k) premarket notification. The FDA finding of substantial equivalence of your device to a legally marketed predicate device results in a classification for your device and thus, permits your device to proceed to the market.
If you desire specific advice for your device on our labeling regulation (21 CFR Part 801 and additionally 809.10 for in vitro diagnostic devices), please contact the Office of Compliance at (301) 594-4613. Additionally, for questions on the promotion and advertising of your device, please contact the Office of Compliance at (301) 594-4639. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR 807.97). Other general information on your responsibilities under the Act may be obtained from the Division of Small Manufacturers Assistance at its toll-free number (800) 638-2041 or (301) 443-6597 or at its Internet address "http://www.fda.gov/cdrb/dsmaldsmam.html".
Sincerely yours,
Kilian Yin, Ph.D.
Lillian Yin, Ph.D. Director, Division of Reproductive Abdominal. Ear. Nose and Throat and Radiological Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
{5}------------------------------------------------
## 510(k) Number (if known): TREX MRI MAGNETIC RESONANCE DIAGNOSTIC DEVICE+ Device Name: SUPPLEMENTAL RF COILS Indications for Use: The TREX MRI system produces cross-sectional images:
- Anatomical Region: General body anatomy, including head, spine, forso, and ●
- extremities 1 H nuclei (Proton) Nucleus excited: ● Images correspond to the distribution of 1H nuclei exhibiting Diagnostic uses: nuclear magnetic resonance, with image intensity dependent upon NMR parameters, including - spin-lattice relaxation time (TT) - spin-spin relaxation time (T2) - density of nuclel (p) - flow velocity - chemical shift (8) Images may be interpreted by a trained physician to yleld Clinical use: . information that can be useful In the determination of a diagnosis. Head - quadrature ● RF Coils: Cervical Spine - quadrature Lumbar Spine, Thoracic Spine, and Abdomen - quadrature Knee - linear Spin Echo Image Acquisition . Gradient Echo (GE,RGE) Fast Spin Echo (FSE) Fast Dual Echo (FDE) 3D Fast Gradient Echo (3DGE, 3DRGE) Inversion Recovery with Fast Spin Echo (FSE STIR, FSE FLAIR)
(PLEASE DO NOT WRITE BELOW THIS LINE - CONTINUE ON ANOTHER PAGE IF NEEDED)
Concurrence of CDRH, Office of Device Evaluation (ODE)
(Division Sign-Off)
Division of Reproductive, Abdominal, ENT,
and Radiological Devices
510(k) Number K982157
Prescription Use
(Per 21 CFR 801-109
OR
Over-the-Counter Use
(Optional Format 1-2-96) Back to Table of Contents
