HASTE/Single-Shot FSE/Single-Shot TSE/FASE/EXPRESS
Half-Fourier-Acquired Single-shot Turbo Spin Echo (HASTE) is a turbo spin-echo technique used for the sequential acquisition of high-resolution T2-weighted images. HASTE employs a single-shot technique to acquire sufficient data for an entire image within a single TR. The HASTE imaging method utilizes a technique called half-Fourier in phase, where it collects only half of the lines in k-space and extrapolates the rest. A HASTE sequence can produce 2D slices in less than a second.
HASTE MRI image appearance
The easiest way to identify HASTE images is to look for fluid-filled spaces in the body, such as cerebrospinal fluid in the brain ventricles and spinal canal, free fluid in the abdomen, fluid in the gall bladder and common bile duct, synovial fluid in joints, fluid in the urinary tract and urinary bladder, as well as edema or any other pathological fluid collections in the body. Fluids normally appear very bright in HASTE images. The most common difference between the TrueFISP and HASTE sequences is that blood vessels appear dark in HASTE and bright in TrueFISP. TrueFISP sequences are more prone to susceptibility and chemical shift artifacts.
Tissues and their Haste appearance
Bone marrow : – equal to or higher than that of muscle (fatty marrow is usually bright)
Spleen :- gray
Muscles :- dark
White matter – darker than gray
Moving blood- dark
Gray matter – gray
Liver : dark
Fluids : – very bright
Bone : – dark
Fat : – bright
Air : – dark
Use
- Very useful for MRCP imaging
- Very useful for urography imaging
- Very useful for sialography imaging
- Very useful for SMRCP imaging
- Very useful for abdominal imaging
- Very useful for small bowel and MR colonoscopy imaging
- Very useful for chest imaging
- Useful for brain imaging (to acquire fast scans in uncooperative patients)
- Useful for liver imaging
HASTE AXIAL 4 MM SEQUENCE USED IN MRCP IMAGING
HASTE CORONAL 4 MM SEQUENCE USED IN ENTEROGRAPHY IMAGING
HASTE CORONAL 3 MM SEQUENCE USED IN UROGRAPHY IMAGING
HASTE CORONAL 60 MM SEQUENCE USED IN MRCP IMAGING
HASTE CORONAL 30 MM SEQUENCE USED IN SIALOGRAPHY IMAGING
HASTE CORONAL 60 MM SEQUENCE USED IN UROGRAPHY IMAGING
HASTE AXIAL 5 MM SEQUENCE USED IN UNCOOPERATIVE PATIENTS BRAIN IMAGING
