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Double Inversion Recovery T1 MeasurementInfoSheet: - Sequences - 
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(DIR or DIRT1) Double inversion recovery T1 measurement is a T1 weighted black blood MRA sequence in which the signal from blood is suppressed. The inversion time to suppress blood is described as the duration between the initial inversion pulse and time point that the longitudinal magnetization of blood reaches the zero point. The readout starts at the blood suppression inversion time (BSP TI) and blood in the imaging slice gives no signal. This inversion time is around 650 ms with a 60 beat per minute heart rate at 1.5 T.
The TI can be decreased by using a wider receive bandwidth, shorter echo train length and/or narrow trigger window. Wide bandwidth also decreases the blurring caused by long echo trains at the expense of signal to noise ratio. In case of in plane or slow flow the suppression of the signal from blood may be incomplete. With increased TE or change of the image plane the blood suppression can be improved.
Double inversion recovery is a breath hold technique with one image per acquisition used in cardiovascular imaging. The patient is instructed to hold the breath in expiration (if not possible also inspiration can be taken), so that the end diastolic volume in the cardiac chambers would be the same during entire scanning. DIR provides fine details of the boundary between the lumen and the wall of the cardiac chambers and main vascular and heart structures, pericardium, and mediastinal tissues.
 
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 Normal Dual Inversion Fast Spin-echo  Open this link in a new window
      

Courtesy of  Robert R. Edelman

 
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• Related Searches:
    • Prepulse
    • Saturation Pulses
    • Cardiac MRI
    • Black Blood MRA
    • Inversion Recovery
 
Further Reading:
  News & More:
Artificial double inversion recovery images can substitute conventionally acquired images: an MRI-histology study
Wednesday, 16 February 2022   by www.nature.com    
MRI Resources 
Process Analysis - Knee MRI - Online Books - Cardiovascular Imaging - Shoulder MRI - Safety Training
 
Small Tip Angle Gradient Echo T1 WeightedInfoSheet: - Sequences - 
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Short T1-Relaxation Gastrointestinal AgentsInfoSheet: - Contrast Agents - 
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Protons in -CH2- groups, e.g., contained in fatty emulsions, mineral or vegetable oil or sucrose polyester, have a fast relaxation and short T1 time. These agents with short T1-relaxation, if used in gastrointestinal imaging, produce bright signal intensities in the intestine on T1 weighted sequences. Palatable oil emulsions can produce appropriate contrast opacification of the stomach as well as the small bowel, but caused by absorption in the distal small bowel these materials are not suitable for use in MRI colonoscopy.

See also Positive Oral Contrast Agents and Gastrointestinal Paramagnetic Contrast Agents.
 
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 MR Colonography Gadolinium per Rectum  Open this link in a new window
      

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T1W High Resolution Isotropic Volume ExaminationInfoSheet: - Sequences - 
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(THRIVE) THRIVE is an optimized fast T1 weighted 3 dimensional imaging technique combining sensitivity encoding, large volume coverage and uniform fat suppression. THRIVE improves for example dynamic liver, small bowel, breast, prostate and pancreas MRI, providing isotropic images with high resolution in short breath-hold times.
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MRI Resources 
MRI Training Courses - Education - DICOM - Absorption and Emission - Musculoskeletal and Joint MRI - Education pool
 
Contrast Enhanced Fast Field Echo with T1 WeightingInfoSheet: - Sequences - 
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