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4C096 MAGNETIC RESONANCE IMAGING APPARATUS
A61B5/055 -5/055,400
A61B5/055-5/055,400 AA AA00
USE 		AA01 AA02 AA03 AA04 AA05 AA06 AA07 AA08 AA09 AA10
. Topography . . Stationary images . . T1 images including T1-weighted images . . T2 images including T2-weighted images . . Images of proton densities . . Images of chemical shifts . . . Water-fat separated images . . Cine images . . . Cardiac cine images . . Angiography
AA11 AA12 AA13 AA14 AA15 AA17 AA18 AA20
. Photographing using contrast preparations . Photographing fluoroscopic images . Spectroscopy . Spectroscopic imaging . . of particular elements * . Diffusion or perfusion . combined with other apparatus * . Others *
AB AB00
PURPOSE 		AB01 AB02 AB03 AB04 AB05 AB06 AB07 AB08 AB09
. Improving image quality . . of spatial resolution or having high definition data . . of time resolution or having high frame rate . . of density resolutions or contrasts . . removing or correcting distortions . . . caused by eddy currents . . reducing noises and improving the signal to noise ratio . . of sharpness . . for uniforming quality
AB11 AB12 AB13 AB14 AB15 AB16 AB17 AB18 AB19 AB20
. Removing artifacts . . caused by body motion including respiration . . caused by flow . . caused by chemical shifts . . caused by aliasing . . . in the directions of frequencies . . . in the directions of phases . . caused by inhomogeneous magnetic fields . . of truncation . . Shading
AB22 AB24 AB25 AB26 AB27 AB29
. . of DC or low frequency noises . Acceleration of photographing . . of collecting data . . of reconstruction operation . . of image processing . of image transfer
AB31 AB32 AB33 AB34 AB36 AB37 AB38 AB39
. Improvement of magnetic field characteristics . . of static magnetic fields . . of gradient magnetic fields . . of radiofrequency fields . Improvement of operability . . by facilitating handling of the apparatus . . by automation . . of photographing efficiencies or throughputs
AB41 AB42 AB43 AB44 AB45 AB46 AB47 AB48 AB50
. Adding functions to the apparatus . Miniaturising simplifying or reducing costs of the apparatus . Energy saving . Improving reliability . Improving maintainability; Facilitating adjustment . Improving safety of patients or operators . Improving patients' environments . Improving shielding performance . Others *
AC AC00
REGION 		AC01 AC02 AC03 AC04 AC05 AC06 AC07 AC08 AC10
. Heads including faces . . Orbits . Necks . Chests or hearts . Abdomens . Spines or spinal cords . Lumbar regions . Extremities including knee joints . Others *
AD AD00
CONTROLLING 		AD01 AD02 AD03 AD05 AD06 AD07 AD08 AD09 AD10
. Types of controlling . . of single apparatus or systems . . of multiple apparatus or systems . Objects to be controlled . . Pulse sequences . . Scanning conditions . . Static magnetic field systems or bodies thereof . . Gradient magnetic field systems . . Radiofrequency transmitting and receiving systems or RF coils
AD12 AD13 AD14 AD15 AD16 AD17 AD18 AD19
. . Collecting processing or transmitting data . . Reconstructing images . . Processing images . . Indicating or outputting images or the like . . Recording transmitting or storing images . . Indicating operations or conditions . . Supporting travelling or fastening subjects . . Accessories or facilities
AD21 AD22 AD23 AD24 AD25 AD26 AD27 AD28 AD29 AD30
. Systems for producing signals for control . . with switches or by switch operation . . sequentially by behaviours of apparatus . . Preset systems including memory type programmes . . based on comparisons between signals . . using signals of synchronising signal sources . . . Biological signals . . . TV synchronising signals . . using speech signals . Others *
BA BA00
PULSE SEQUENCE 		BA01 BA02 BA03 BA04 BA05 BA06 BA07 BA08 BA09 BA10
. Flip angles of 90 degrees . Flip angles of less than 90 degrees . Using FID signals . Using echo signals . . by 180 degree pulses . . by gradient magnetic fields . . Multiple echo signals . . Timing of generating echo signals . . . Half-echoes . . encoding echo signals
BA12 BA13 BA15 BA16 BA18 BA19 BA20
. . . Half-encoding . . . Encoding orders . Multiple slice scanning . . Multiple-angle scanning . 3D scanning . Inverting spins before excitation . Presaturation
BA21 BA22 BA23 BA24 BA25 BA26 BA27
. Flow compensation . Body motion compensation . Forced recovery . Steady-state scanning . Using spoiler pulses . Rewinding warp gradients in single TR . Cancelling all gradient magnetic fields in single TR
BA31 BA32 BA33 BA34 BA36 BA37 BA38
. Selecting regions . . in the biaxial directions . . in the triaxial directions . . . of volumes . Flow imaging or angiographies . . Time-of-flight methods . . Phase contrast methods
BA41 BA42 BA50
. High speed scanning . Very high speed scanning e.g. echo-planar imaging . Others *
BB BB00
SCANNING CONDITION 		BB01 BB02 BB03 BB05 BB06 BB07 BB08 BB10
. Pulse waveforms . . to gradient pulses . . of RF pulses . Time constants . . TR . . TE . . TI . Flip angles
BB11 BB12 BB13 BB14 BB15 BB16 BB18 BB19
. Number of echoes . Slice constants . . Number of slices . . Thicknesses of slices . . Intervals of slices . . Angles of slices . Fields of views or FOV . . Thicknesses of slabs
BB21 BB22 BB23 BB24 BB25 BB27 BB28 BB29 BB30
. Scan planes . . Axial imaging . . Sagittal imaging . . Coronal imaging . . Oblique imaging . Average number . Image matrices . . Number of views . . Number of samples
BB31 BB32 BB40
. Automatic setting . . by test scanning before main scanning . Others *
CA CA00
STATIC MAGNETIC FIELD SYSTEM OR BODY THEREOF 		CA01 CA02 CA03 CA04 CA05 CA06 CA07 CA08 CA09 CA10
. Magnets . . Superconducting magnets . . Resistive electromagnets or electromagnets . . . Air-core magnets . . Permanent magnets . . . Magnets per se . . . Pole pieces . . . Yokes . . . . in the shape of C . . . . in the shape of H
CA12 CA14 CA15 CA16 CA17 CA18
. . Hybrid magnets . Directions of magnetic fields . . horizontal . . vertical . . parallel to the axes of subjects . . crossing the axes of subjects
CA21 CA22 CA23 CA24 CA25 CA26 CA27 CA29
. Adjusting homogeneities of magnetic fields . . by superconducting coils . . by resistive coils . . by permanent magnets . . by steel pieces . . CSI shimming . . automatically . Detecting magnetic fields
CA31 CA32 CA33 CA34 CA35 CA36 CA38 CA39 CA40
. Structures or arrangement of coils . . of static magnetic fields . . . Solenoid types . . . Double Helmholtz types . . Shim coils . . Supporting or attaching coils . Magnetic shields . . Active types . . . by superconducting coils
CA42 CA43 CA44 CA47 CA48 CA49
. . Passive types . . . by yokes for self-shielding . . . by cages . Power supplies or circuits for magnetisation . . of superconducting magnets . . of constant currents for resistive electromagnets
CA51 CA52 CA53 CA54 CA55 CA56 CA58 CA59 CA60
. Isothermal apparatus e.g. for temperature control . . Cryostats . . . heat shielding . . . freezing cryostats . . involving resistive electromagnets . . involving permanent magnets . Structures of bodies . . Frames . . Covers
CA62 CA63 CA64 CA65 CA66 CA67 CA68 CA70
. . RF shields . . Environments of patient receiving spaces . . . Lighting . . . Fields of vision . . . Sounds . . . . Insulation of sounds . . . Air conditioning . Others *
CB CB00
GRADIENT MAGNETIC FIELD SYSTEM 		CB01 CB02 CB03 CB04 CB05 CB06 CB07 CB08 CB09 CB10
. Structures or arrangement of gradient coils . . Helmholtz types . . Saddle types . . Spiral types . . Types for cancelling external magnetic fields . . Resonance types . . Supporting or attaching coils . Generating gradient pulse waveforms . . analogue . . digital
CB11 CB12 CB13 CB16 CB17 CB19 CB20
. Gradient power supplies . . Power amplifiers . . . Switching systems . Correcting eddy currents . . by waveforms of gradient pulses . Suppressing coil vibration sounds . Others *
CC CC00
RADIOFREQUENCY TRANSMITTING SYSTEM OR RF COIL 		CC01 CC02 CC03 CC04 CC05 CC06 CC07 CC08 CC09 CC10
. Structures or arrangement of RF coils . . Saddle types . . Solenoid types . . Slot resonator types . . Bird cage types . . Phased array type . . Quadrature types . . Surface coils . . . for specific regions * . . . inserted into body cavities
CC12 CC13 CC14 CC15 CC16 CC17 CC18 CC19 CC20
. . Supporting or attaching coils . . for managing coil cables . Circuits of RF coils . . Tuning or synchronising . . Decoupling . . Connecting or switching coils . Baluns . Generating RF signals . . Reference oscillators
CC22 CC23 CC24 CC26 CC27 CC29 CC30
. . Synthesisers . . Mixers . . Band limiting . Generating waveforms of excitation pulses . . Digital systems . Pulse modulations . Gates
CC31 CC32 CC33 CC34 CC37 CC38 CC40
. Adjusting phases . Power amplifying; Driving . . Driving quadrature coils . . Monitors of output levels . Adjusting load impedances . Adjusting strength of radiofrequency fields . Others *
CD CD00
RADIOFREQUENCY RECEIVING SYSTEM 		CD01 CD02 CD03 CD04 CD05 CD06 CD07 CD08 CD09 CD10
. Amplifying . . Pre-amplifying . . Gain adjustment . Gates . Frequency conversion . Band limiting . Detecting phases . . digitally . . Quadrature detection . Others *
DA DA00
COLLECTING, PROCESSING, OR TRANSMITTING DATA 		DA01 DA02 DA03 DA04 DA05 DA06 DA08 DA09
. Sampling . AD conversion . Storing data temporarily . Correcting . . Offset correction . . Phase correction . Filtering . . Digital filters
DA11 DA12 DA13 DA14 DA15 DA17 DA18 DA19 DA20
. Mean . Sorting . Thinning . Interpolation . Weighing . Collecting biosignals . . Electrocardiogram signals . . Respiratory signals . . Peripheral or pulse wave signals
DA21 DA22 DA23 DA24 DA30
. Transmitting data . . optically . . Parallel-serial conversions . . Serial-parallel conversions . Others *
DB DB00
IMAGE RECONSTRUCTION 		DB01 DB02 DB03 DB04 DB06 DB07 DB08 DB09 DB10
. Reconstruction techniques . . Two-dimensional Fourier transform methods . . Three-dimensional Fourier transform methods . . Projection restoration methods . Image calculations . Operation processing . . of projection data . . . making composite data or secondary data . . Fourier transform operation
DB12 DB13 DB14 DB15 DB16 DB17 DB18 DB19 DB20
. . characterised by the procedures of operation execution . . . High-speed operation systems . . . . Processing in parallel . . . . Pipeline processing . Images without aliasing . . in the frequency directions . . in the phase directions . Setting fields of vision at the time of reconstructing images . Others *
DC DC00
IMAGE PROCESSING 		DC01 DC02 DC03 DC04 DC05 DC06 DC08 DC09
. for correcting deterioration of image quality . . correcting distortions . . . of densities . . . of phases . . removing noises . . restoring blurred images . for correcting uniformities . . Smoothing
DC11 DC12 DC14 DC15 DC16 DC18 DC19 DC20
. Enhancement processing including suppressing . . Gradation conversions or greyscale conversions . Geometrical transformation processing . . by movements e.g. translations or rotations . . by enlarging or reducing . for detecting objects e.g. clipping . . Profiles . . Lesioned sections
DC21 DC22 DC23 DC24 DC25 DC27 DC28 DC29 DC30
. for detecting characteristics . for measuring or analysing based on images . . Distances or lengths . . Areas or volumes . . Dynamic analyses . for setting regions . . Regions of interest (ROI) . for density resolutions . . Windows e.g. widths or levels
DC31 DC32 DC33 DC35 DC36 DC37 DC38 DC40
. for multiple images . . Multiframes . . between images . for making special images . . Three-dimensional images . . indicating desired cross-section . . Images composed of laminated multiple slice images . Others *
DD DD00
INDICATING OR OUTPUTTING IMAGE OR THE LIKE 		DD01 DD02 DD03 DD04 DD05 DD06 DD07 DD08 DD09 DD10
. Indicating devices . . having multiple indicating devices . . Resolution or indication speeds . . CRTs . . Flat displays . Controlling luminance . Colour indications . Interactive input devices e.g. light pens . . Joysticks track balls or the like . . Touch panels
DD11 DD12 DD13 DD14 DD15 DD16 DD18 DD19 DD20
. Auxiliary indications . . of scales . . of markers . . of graphs . . of biological signals . . of numerical values or characters . Outputting diagnostic reports . Indications or outputs by speeches . Others *
DE DE00
RECORDING, TRANSMITTING, OR STORING IMAGE 		DE01 DE02 DE03 DE04 DE05 DE06 DE07 DE08 DE09 DE10
. Compressing or restoring data . Temporary storages by memory . . corresponding to additional information . Digital records e.g. optical discs or digital disc recorders (DDR) . Analogue records e.g. video tape recorders (VTR) . Transmissions e.g. optical transmissions or interfaces . Image database . . Data accesses or retrievals . Giving data identification information . Others *
EA EA00
INDICATING BEHAVIOUR OR CONDITION 		EA01 EA02 EA03 EA04 EA05 EA06 EA07 EA10
. Photographing conditions . Identification (ID) . Slice planes . Travel distances . Time . Abnormal conditions . . involving alarms . Others *
EB EB00
SUPPORTING, MOVING OR FASTENING SUBJECT 		EB01 EB02 EB03 EB04 EB05 EB06 EB07 EB08 EB09 EB10
. Beds or tables . . Shapes or materials . . Supporting mechanisms . . Moving mechanisms . . . for vertical movements . . . for horizontal movements or turnings . Appliances for supporting or fastening . Positioning . Anti-collision or anti-sandwiching . Others *
FA FA00
TESTING, MAINTENANCE, OR MANAGEMENT 		FA01 FA02 FA03 FA04 FA05 FA06 FA07
. Reference settings e.g. phantoms . . for testing spatial resolutions . . for testing spatial distortions . . for testing homogeneities or signal to noise ratios . . for slice widths . . Structures or materials . . Arrangements
FA11 FA12 FA13 FA20
. Maintenances or managements . . of cooling agents in cryostats . . of cooling water for resistive electromagnets . Others *
FB FB00
SAFETY OR PROTECTION 		FB01 FB02 FB03 FB04 FB05 FB06 FB07 FB09 FB10
. against subjects' absorption of RF powers . against heat of metals caused by RF currents . against attraction or repulsion of magnetic materials . against evaporation of cooling agents . . monitoring oxygen; Warning . . releasing evaporated gases . . . Emergency evacuation . of the apparatus . Others *
FC FC00
ACCESSORY OR FACILITY 		FC01 FC02 FC03 FC04 FC05 FC06 FC07 FC09 FC10
. Shielded rooms . . Walls or ceilings . . Openings . . . Entrances . . . Windows . . Floors . . Penetrations . Monitoring patients . Communication with patients
FC11 FC12 FC13 FC14 FC16 FC17 FC20
. Cameras for hard copies . Automatic developing machines . Printers . Contrast preparations or syringes . Operation panels . . of arrangement or structures of operating units. . Others *
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