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 STIR            Short T1 Inversion Recovery 
Searchterm 'STIR' was found in the Abbreviation Register. 
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O-SCAN™InfoSheet: - Devices -
Intro, 
Types of Magnets, 
Overview, 
etc.
 
www.fonar.com/standup.htm www.fonar.com/standup.htm O-scan is manufactured and distributed by Esaote SpA
O-scan is a compact, dedicated extremity MRI system designed for easy installation and high throughput. The complete system fits in a 9’ x 10’ room, doesn’t need for RF or magnetic shielding and it plugs in the wall. The 0.31T permanent magnet along with dual phased array RF coils, and advanced imaging protocols provide outstanding image quality and fast 25 minute complete examinations.
Esaote North America is the exclusive distributor of the O-scan system in the USA.

Device Information and Specification
CLINICAL APPLICATION Dedicated Extremity
CONFIGURATION Closed
SURFACE COILS Dual phased array knee, hand, foot//ankle/elbow
PULSE SEQUENCES SE, HSE, HFE, GE, 2dGE, ME, IR, STIR, Stir T2, GESTIR, TSE, TME, FSE STIR, FSE (T1, T2), X-Bone, Turbo 3DT1, 3D SHARC, 3D SST1, 3D SST2
IMAGING MODES 2D, 3D multi-plane, half echo, half scan, real time
TR 10 - 10,000 msec.
TE 6 - 220 msec.
SINGLE SLICE 0.1 sec.
MULTI SLICE 0.1 sec.
FOV 14 cm
SLICE THICKNESS 2D: 2mm - 10 mm, 3D: 0.6 - 10 mm
DISPLAY MATRIX 512 x 512
MEASURING MATRIX 512 x 512 max.
PIXEL INTENSITY 4,096 grey levels
SPATIAL RESOLUTION 0.2 mm
MAGNET TYPE Permanent - NdFeB
MAGNET WEIGHT 2,733 lbs
POWER REQUIREMENTS 100/110/200/220/230/240
FIELD STRENGTH 0.31T
STRENGTH 20 mT/m
5 GAUSS FRINGE FIELD, radial/axial 67 cm / 75 cm
SHIMMING passive
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MRI Resources 
Health - General - MRI Accidents - Service and Support - MR Guided Interventions - Safety Training
 
Fat SuppressionForum -
related threads
 
Fat suppression is the process of utilizing specific MRI parameters to remove the deleterious effects of fat from the resulting images, e.g. with STIR, FAT SAT sequences, water selective (PROSET WATS - water only selection, also FATS - fat only selection possible) excitation techniques, or pulse sequences based on the Dixon method.
Spin magnetization can be modulated by using special RF pulses. CHESS or its variations like SPIR, SPAIR (Spectral Selection Attenuated Inversion Recovery) and FAT SAT use frequency selective excitation pulses, which produce fat saturation.
Fat suppression techniques are nearly used in all body parts and belong to every standard MRI protocol of joints like knee, shoulder, hips, etc.


Image Guidance
Imaging of, e.g. the foot can induce bad fat suppression with SPIR/FAT SAT due to the asymmetric volume of this body part. The volume of the foot alters the magnetic field to a different degree than the smaller volume of the lower leg affecting the protons there. There is only a small band of tissue where the fat protons are precessing at the frequency expected, resulting in frequency selective fat saturation working only in that area. This can be corrected by volume shimming or creating a more symmetrical volume being imaged with water bags.
Even with their longer scan time and motion sensitivity, STIR (short T1//tau inversion recovery) sequences are often the better choice to suppress fat. STIR images are also preferred because of the decreased sensitivity to field inhomogeneities, permitting larger fields of views when compared to fat suppressed images and the ability to image away from the isocenter.
See also Knee MRI.
Recently introduced Dixon turbo spin echo (fast spin echo) sequences can deliver a significant better fat suppression than conventional TSE//FSE imaging.

 
Images, Movies, Sliders:
 Shoulder Axial T2 FatSat FRFSE  Open this link in a new window
    

Courtesy of  Robert R. Edelman
 MRI Orbita T2 FatSat  Open this link in a new window
    
 Knee MRI Sagittal STIR 001  Open this link in a new window
 MRI - Anatomic Imaging of the Ankle 3  Open this link in a new window
    
SlidersSliders Overview

 
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• View the DATABASE results for 'Fat Suppression' (28).Open this link in a new window

 
Further Reading:
  Basics:
Techniques of Fat Suppression(.pdf)
   by cds.ismrm.org    
  News & More:
Enhanced Fast GRadient Echo 3-Dimensional (efgre3D) or THRIVE
   by www.mri.tju.edu    
Ultrashort echo time (UTE) MRI of the spine in thalassaemia
February 2004   by bjr.birjournals.org    
MRI Resources 
Shielding - Cardiovascular Imaging - Resources - Musculoskeletal and Joint MRI - MRI Physics - Online Books
 
Panorama 0.6T™InfoSheet: - Devices -
Intro, 
Types of Magnets, 
Overview, 
etc.MRI Resource Directory:
 - Devices -
 
From Philips Medical Systems;
www.medical.philips.com/main/products/mri/products/panoramafamily/panorama0.23t_rt/features/ Panorama 0.6 T is the Philips Mid-Field Open MRI system. It is the most open MR scanner in the market, optimized for patient comfort and faster reconstruction time.

Device Information and Specification
CLINICAL APPLICATION Whole body
CONFIGURATION Open MRI/C-arm
SURFACE COILS Head, head-neck, extremity, neck, body/spine M-XL, shoulder, bilateral breast, wrist, TMJ, flex XS-S-M-L-XL-XXL
SPECTROSCOPY No
SYNCHRONIZATION ECG/peripheral: Optional/yes, respiratory gating
PULSE SEQUENCES SE, FE, IR, STIR, FFE, DEFFE, DESE, TSE, DETSE, Single shot SE, DRIVE, Balanced FFE, MRCP, Fluid Attenuated Inversion Recovery, Turbo FLAIR, IR-TSE, T1-STIR TSE, T2-STIR TSE, Diffusion Imaging, 3D SE, 3D FFE, Contrast Perfusion Analysis, MTC;; Angiography: CE-ANGIO, MRA 2D, 3D TOF
IMAGING MODES Single, multislice, volume study, dynamic, SIMEX, multi chunk 3D, multiple stacks
TR Min. 4.6 msec
TE Min. 2.3 msec
SINGLE/MULTI SLICE 50 slices/sec
FOV 0.4 cm - 42 cm
SLICE THICKNESS 0.4 mm
DISPLAY MATRIX 1280 X 1024
MEASURING MATRIX Up to 512 x 512
PIXEL INTENSITY 256 gray scale
SPATIAL RESOLUTION 0.78 mm
MAGNET TYPE Superconducting / iron core
BORE DIAMETER
or W x H
Open x 47 cm x infinite (side-first patient entry)
MAGNET WEIGHT 38000 kg
H*W*D 254 x 244 x 325 cm
POWER REQUIREMENTS 400/480 V
COOLING SYSTEM TYPE Liquid helium//air cool
CRYOGEN USE 0.00 L/hr helium
FIELD STRENGTH 0.6 T
STRENGTH 20 mT/m
5-GAUSS FRINGE FIELD 2.4 m / 2.5 m
SHIMMING Passive/active
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Panorama 1.0T™InfoSheet: - Devices -
Intro, 
Types of Magnets, 
Overview, 
etc.MRI Resource Directory:
 - Devices -
 
From Philips Medical Systems;
www.medical.philips.com/main/products/mri/products/panoramafamily/panorama1.0t_rt/features/ this active shielded member of the Panorama product line combines the advantages of one 1.0 T system's with the possibilities of an open MRI system. The open design helps ease anxiety for claustrophobic patients and increased patient comfort whereby the field strength provides spectacular image quality and fast patient throughput.
Device Information and Specification
CLINICAL APPLICATION Whole body
CONFIGURATION Vertical Field open MRI post design
SURFACE COILS Vertically opposed solenoids, head, head-neck, extremity, neck, body/spine M-XL, shoulder, bilateral breast, wrist, TMJ, flex XS-S-M-L-XL-XXL
SPECTROSCOPY No
SYNCHRONIZATION ECG/peripheral: Optional/yes, respiratory gating
PULSE SEQUENCES SE, FE, IR, STIR, FFE, DEFFE, DESE, TSE, DETSE, Single shot SE, DRIVE, Balanced FFE, MRCP, FLAIR, Turbo FLAIR, IR-TSE, T1-STIR TSE, T2-STIR TSE, Diffusion Imaging, 3D SE, 3D FFE, Contrast Perfusion Analysis, MTC;; Angiography: CE-ANGIO, MRA 2D, 3D TOF
IMAGING MODES Single, multislice, volume study, dynamic, SIMEX, multi chunk 3D, multiple stacks
TR Min. 4.6 msec
TE Min. 2.3 msec
SINGLE/MULTI SLICE 50 slices/sec
FOV 0.4 cm - 42 cm
SLICE THICKNESS 0.4 mm
DISPLAY MATRIX 1280 X 1024
MEASURING MATRIX Up to 512 x 512
PIXEL INTENSITY 256 gray scale
SPATIAL RESOLUTION 0.78 mm
MAGNET TYPE Superconducting
BORE DIAMETER
or W x H
Open x 47 cm x infinite (side-first patient entry)
MAGNET WEIGHT
H*W*D
POWER REQUIREMENTS 400/480 V
COOLING SYSTEM TYPE Liquid helium
CRYOGEN USE
FIELD STRENGTH 1.0 T
STRENGTH 20 mT/m
5-GAUSS FRINGE FIELD
SHIMMING Passive/active
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• View the DATABASE results for 'Panorama 1.0T™' (2).Open this link in a new window

MRI Resources 
Quality Advice - Homepages - Implant and Prosthesis - Contrast Enhanced MRI - Service and Support - Mass Spectrometry
 
Quadrupole ArtifactInfoSheet: - Artifacts - 
Case Studies, 
Reduction Index, 
etc.MRI Resource Directory:
 - Artifacts -
 
Quick Overview

Artifact Information
NAME Quadrupole artifact
DESCRIPTION Signal loss, intensity variations
REASON B1 disturbance
HELP STIR

Fat suppression (SPIR or FatSat) is very critical to the magnetic field homogeneity. Eddy currents in the patient results in B1 disturbance from left to right and from anterior to posterior. The artifact is seen as signal intensity variations with SPIR, like a signal intensity loss diagonal in the image. The short T1 inversion recovery (STIR) sequence is due to another type of fat suppression insensitive to this artifact.


Image Guidance
Take short T1 inversion recovery (STIR) instead spectral presaturation inversion recovery (SPIR) for fat suppression.
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