MAGNETIC RESONANCE DIAGNOSTIC DEVICE, VERSION 5.0 OPERATING SYSTEM SOFTWARE

K984274 · Hitachi Medical Systems America, Inc. · LNH · Jan 25, 1999 · Radiology

Device Facts

• Record ID: K984274
• Device Name: MAGNETIC RESONANCE DIAGNOSTIC DEVICE, VERSION 5.0 OPERATING SYSTEM SOFTWARE
• Applicant: Hitachi Medical Systems America, Inc.
• Product Code: LNH · Radiology
• Decision Date: Jan 25, 1999
• Decision: SESE
• Submission Type: Traditional
• Regulation: 21 CFR 892.1000
• Device Class: Class 2

Intended Use

The MR system is an imaging device, and is intended to provide the physician with physiological and clinical information, obtained non-invasively and without the use of ionizing radiation. The MR system produces transverse, coronal, sagittal, oblique, and curved cross-sectional images that display the internal structure of the head, body, or extremities. The images produced by the MR system reflect the spatial distribution of protons (hydrogen nuclei) exhibiting magnetic resonance. The NMR properties that determine the image appearance are proton density, spin-lattice relaxation time (T1), spin-spin relaxation time (T2), and flow. When interpreted by a trained physician, these images provide information that can be useful in diagnosis determination.

Device Story

Device is an operating system software update (Version 5.0) for Hitachi AIRIS and MRP-7000 MRI systems. System uses RF excitation and magnetic field gradients to manipulate hydrogen nuclei; measures resulting RF emissions to construct 3D spatial images. Software update adds clinical utility via new acquisition sequences: 3D SG TOF MRA, high SNR MR Fluoroscopy, 3D FSE/FIR, T1-weighted 2D FSE, and 2D RF-spoiled SARGE. Enhancements include improved fat suppression (STIR/Fast STIR), Dual Slice function, small FOV FSE, rephase for FIR, ECG-gating for 2D SG, and off-resonance MTC. Raw data filter added to reduce truncation artifacts. Operated by trained clinicians in stationary or mobile settings. Output is cross-sectional anatomical images used by physicians for diagnostic determination. Benefits include high-quality anatomical imaging without ionizing radiation.

Clinical Evidence

No clinical data provided. Substantial equivalence is based on bench testing and technical verification of the software-based image acquisition and processing enhancements.

Technological Characteristics

MR imaging system using proton excitation. Software-defined acquisition sequences (SE, FSE, FIR, GE, GR, SARGE, TOF MRA). Features include ECG-gating, magnetization transfer contrast (MTC), and raw data filtering. Connectivity includes standard MR system interfaces. System operates on stationary or mobile configurations. Software is embedded firmware/OS.

Indications for Use

Indicated for patients requiring non-invasive diagnostic imaging of the head, body, spine, and extremities to visualize internal structures via proton density, T1, T2, and flow-based MR imaging. No specific contraindications listed.

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.

Predicate Devices

• Hitachi AIRIS with Version 4.0 Operating System Software
• Hitachi MRP-7000 with Version 4.0 Operating System Software

Submission Summary (Full Text)

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JAN 25 1999

# Attachment 1 510(k) Summary of Safety and Effectiveness

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# SUBMITTER INFORMATION: 1.0

- Hitachi Medical Systems America 1.1 Submitter: 1963 Case Parkway Twinsburg, OH 44087 PH: 216 425-1313 FX: 216 425-1410
- James Jochen Rogers 1.2 Contact:
- November 26, 1998 1.3 Date:

# DEVICE NAME: 2.0

- Magnetic Resonance Diagnostic Device 2.1
- System, Nuclear Magnetic Resonance Imaging 2.2 Classification Name:
- 2.3 Classification Number: 90LNH
- Version 5.0 Operating System Software Trade/Proprietary Name: 2.4

# 2.5 PREDICATE DEVICE(s):

Hitachi AIRIS with Version 4.0 Operating System Software Hitachi MRP-7000 with Version 4.0 Operating System Software

# DEVICE DESCRIPTION: 3.0

# 3.1 FUNCTION

Identical to the AIRIS and MRP-7000 with Version 4.0 Operating System software (Cf. K971279), and the AIRIS and MRP-7000 with Version 4.0D Operating System software as described in a memo-to-file document, dated September 22, 1997.

The AIRIS Operating System Software is revised to Version 5.0 to increase the clinical utility of the AIRIS in the stationary configuration. The MRP-7000 Operating System Software is revised to Version 5.0 to increase the clinical utility of the MRP-7000 in both stationary and mobile configurations.

Version 5.0 Operating System revisions include additional image acquisition sequences (3D SG TOF MRA, high SNR MR Fluoroscopy sequence, 3D FSE/FIR sequences, additional T1-weighted 2D FSE sequence, and addition of 2D RF-spoiled SARGE sequence). Image acquisition sequence enhancements include improvement in fat suppression for STIR and Fast STIR, addition of Dual Slice function to 2D GE/ GR, addition of small FOV FSE sequence, addition of rephase to FIR sequence, addition of ECG-gating to 2D SG sequence (currently available only for 2D SE. GE and GR sequences), and addition of off-resonance MTC to 3D TOF, SE, GE and GR sequences (currently only on-resonance MTC available). A raw data filter is additionally available to reduce truncation artifacts.

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#### 3.2 SCIENTIFIC CONCEPTS

Magnetic Resonance (MR) is based on the fact that certain atomic nuclei have electromagnetic properties which cause them to act as small spinning bar magnets. The most ubiquitous of these nuclei is hydrogen, which makes it the primary nucleus used in current imaging experiments in magnetic resonance. When placed in a magnetic field, there is a slight net orientation or alignment of these atomic nuclei with the magnetic field. The introduction of a short burst of radiofrequency (RF) excitation of wavelength specific to the magnetic field strength and to the atomic nuclei under consideration can cause a reorientation of the proton's magnetization vector. When the RF excitation is removed, the proton relaxes and returns to its original orientation. The rate of relaxation is exponential, and varies with the character of the proton and its adjacent molecular environment. This reorientation process is characterized by two exponential relaxation times called T1 and T2 which can be measured.

These relaxation events are accompanied by an RF emission or echo which can be measured and used to develop a representation of these emissions on a three dimensional matrix. Spatial localization is encoded into the echo by varying the RF excitation and by appropriately applying magnetic field gradients in x, y, and z directions, and changing the direction and strength of these gradients. Images depicting the spatial distribution of NMR characteristics of the nuclei under consideration can be constructed by using image processing techniques similar to those used in CT.

For magnetic fields up to 1.5T, the RF frequencies commonly used range up to 65MHz. The RF fields have pulse powers from several watts to greater than 10 kilowatts, and repeat at rates from once every few seconds to greater than fifty per second. The time-varying magnetic gradient fields have a typical duration of submillisecond to several milliseconds.

# PHYSICAL AND PERFORMANCE CHARACTERISTICS 3.3

MR is currently of great interest because it is capable of producing high quality anatomical images without the associated risks of ionizing radiation. In addition, the biological properties that contribute to MR image contrast are different from those responsible for x-ray image contrast. In x-ray imaging, differences in x-ray attenuation, largely based on differences in electro density are responsible for the contrast observed in x-ray images. In MR imaging, differences in proton density, blood flow, and relaxation times T1 and T2 all may contribute to image contrast. In addition, by varying the duration and spacing of the RF pulses, images may be produced in which the contrast is primarily dependent on T1 relaxation, T2 relaxation, proton density, or a combination of all three.

# 4.0 DEVICE INTENDED USE:

The MR system is an imaging device, and is intended to provide the physician with physiological and clinical information, obtained non-invasively and without the use of ionizing radiation. The MR system produces transverse, coronal, sagittal, oblique, and curved cross-sectional images that display the internal structure of the head, body, or extremities. The images produced by the MR system reflect the spatial

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distribution of protons (hydrogen nuclei) exhibiting magnetic resonance. The NMR properties that determine the image appearance are proton density, spin-lattice relaxation time (T1), spin-spin relaxation time (T2), and flow. When interpreted by a trained physician, these images provide information that can be useful in diagnosis determination.

- Anatomical Region: Head, Body, Spine, Extremities ●
- Nucleus excited: Proton ●

2D T1- / T2-weighted imaging ● Diagnostic uses:

- T1. T2, proton density measurements
- MR Angiography image processing

2D, 3D Spin Echo (SE)

- Imaging capabilities: ●
- 2D, 3D Fast Spin Echo (FSE), Fast Inversion Recovery (FIR)
- 2D,3D Gradient Field Echo (GE); also with rephasing (GR)
- 2D Steady state acquisition with rewinded GE (SARGE)
- 3D Steady state acquisition with rewinded GE (SARGE); also with rephasing
- 2D Dual Slice acquisition (DS)
- MR Angiography (2D TOF, 3D TOF, half echo, high resolution/high definition, sloped slab profile, on- and off-resonance magnetization transfer contrast)
- RF Coil Uniformity

Adaptive Image post-processing

#### DEVICE TECHNOLOGICAL CHARACTERISTICS: 5.0

Identical to the Predicate Device.

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Rockville MD 20850

Food and Drug Administration 9200 Corporate Boulevard

JAN 2 5 1999

James Jochen Rogers Manager, Regulatory Affairs Hitachi Medical Systems America, Inc. 1959 Summit Commerce Park Twinsburg, Ohio 44087-2371

Re:

K984274 Version 5.0 Operating System Software for Hitachi Airis and MRP-7000 Dated: November 26, 1998 Received: November 30, 1998 Regulatory class: II 21 CFR 892.1000/Procode: 90 LNH

Dear Mr. Rogers:

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 legally marketed predicate 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). 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, and prohibitions 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 (QS) 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 531 through 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 [phone]. Additionally, for questions on the promotion and advertising of your device, please contact the Office of Compliance at [phone]. 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 [phone] or [phone], or at its internet address "http://www.fda.gov/cdrh/dsma/dsmamain.html".

Sincerely yours,

Bert David C. Stahl, M.D.

Capt. Daniel G. Schultz, M.D. Acting Director, Division of Reproductive, Abdominal, Ear, Nose and Throat, and Radiological Devices Office of Device Evaluation Center for Devices and Radiological Health

Enclosure

Image /page/4/Picture/14 description: The image is a black and white logo for the U.S. Department of Health & Human Services. The logo features a stylized symbol of a human figure with three wavy lines representing the head, body, and legs. The symbol is enclosed within a circular border, with the text "DEPARTMENT OF HEALTH & HUMAN SERVICES - USA" arranged around the perimeter of the circle.

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# 510(k) Number (if known): _ K 9 8 4 2 74

Device Name: Version 5.0 Operating System Software (AIRIS, MRP-7000)

Indications for Use:

(Per 21 CFR 801-109

The MR system is an imaging device, and is intended to provide the physician with physiological and clinical information, obtained non-invasively and without the use of ionizing radiation. The MR system produces transverse, coronal, sagittal, oblique, and curved crosssectional images that display the internal structure of the head, body, or extremities. The images produced by the MR system reflect the spatial distribution of protons (hydrogen nuclei) exhibiting magnetic resonance. The NMR properties that determine the image appearance are proton density, spin-lattion time (T1), spin-spin relaxation time (T2), and flow. When interpreted by a trained physician, these images provide information that can be useful in diagnosis determination.

- Anatomical Region: Head, Body, Spine, Extremities Nucleus excited: Proton 2D T1- / T2-weighted imaging Diagnostic uses: T1, T2, proton density measurements MR Angiography image processing Imaging capabilities: ● 2D. 3D Spin Echo (SE) 2D Inversion Recovery (IR) 2D, 3D Fast Spin Echo (FSE), Fast Inversion Recovery (FIR) 2D,3D Gradient Field Echo (GE); also with rephasing (GR) 2D Steady state acquisition with rewinded GE (SARGE) 3D Steady state acquisition with rewinded GE (SARGE); also with rephasing 2D Dual Slice acquisition (DS) MR Angiography (2D TOF, 3D TOF, half echo, high resolution/high definition, sloped slab profile, on- and off-resoance magnetization transfer contrast) RF Coil Uniformity Adaptive Image post-processing
(PLEASE DO NOT WRITE BELOW THIS LINE - CONTINUE ON ANOTHER PAGE IF NEEDED)

Concurrence of CDRH, Office of Device Evaluation (ODE)

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| Division of Reproductive, Abdominal, ENT, and Radiological Devices | |
| 510(k) Number | K984274 |

| Prescription Use | OR | Over-the-Counter Use |
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