The 3' -OH of the sugar group forms a bond with one of the negatively charged oxygens of the phosphate group attached to the 5' carbon of another sugar. When many of these nucleotide subunits combine, the result is the large single-stranded polynucleotide or nucleic acid, DNA ().
The length of the exam depends on the type of study being performed. 1  MRI of the Brain â¦ 20-45 minute scan time. 2  MRI of the Orbits â¦ 20-35 minute scan time.3  MRI of the TMJ â¦ 45-60 minute scan time.4  MRI of the Soft Tissue Neck â¦ 25-35 minute scan time.5  MRI of the Cervical Spine â¦ 20-35 minute scan time. MRI of the Brain â¦ 20-45 minute scan time. 2  MRI of the Orbits â¦ 20-35 minute scan time. 3  MRI of the TMJ â¦ 45-60 minute scan time. 4  MRI of the Soft Tissue Neck â¦ 25-35 minute scan time.
With CT, the previous patient can be imaged and the scanner becomes available for the stroke patient in approximately 5 minutes, but with MRI it might take up to a half hour.All these factors cause delays during the time window of opportunity when MRI is the preferred method for imaging. similar approach does not yet exist for CT imaging. The âstroke MRI packageâ includes scout images, DWI, PWI, MRA, T2-weighted imaging and postcontrast T1-weighted imaging. T2*-weighted imaging is produced within the gradient-echo PWI or separately. This whole package can be performed within 20 minutes.