MRI – B 30 Dec Welcome to your MRI - B Professional Name: Email: Contact #: [On Figure arrow E is pointing to the:] Gastrocnemius muscle Achilles tendon Tibio-talar joint Talus Navicular None Comment . [Immediately on the application of the 90° pulse, the precessing protons:] All flip to the high energy state Tip into the transverse plane Begin to precess in phase a and b None . [Images acquired with a spin echo pulse sequence having a SHORT TR and TE values yield images known as (Figure):] T1WI T2WI PDWI Diffusion images None Comment . [Fourier transformation is performed in the:] Fourier transformer Array processor K-spacer RF amplifier None . [Of the following implants, which would be considered acceptable to scan by MRI?] Ferrous aneurysms clips Neurostimulators Cardiac pacemakers Heart valves None . [Increasing slice thickness from 5 to 10 mm (by a factor of 2, i.e. 2 × thicker), the SNR:] Increases by a factor of 2 Increases by a factor of 4 Is not affected Decreases by a factor of 2 None . [Reducing the TE:] Increases the contrast based on T1 relaxation times Increases the spin density contrast weighting Reduces saturation effects Reduces contrast based on T2 relaxation times None . [On Figure the tissue indicated by arrow J is made up primarily of:] White matter Gray matter Cerebrospinal fluid (CSF) Flowing blood None Comment . [Increasing TR:] Increases scan time Inverts scan time Does not affect scan time Decreases scan time None . [On Figure arrow J is pointing to the:] Rectus abdominus muscles Oblique muscles Psoas muscle Lumbar vertebral body Intervertebral disk None Comment . [On Figure the vertebral bodies of the cervical spine can be visualized because:] Bone is radiolucent and therefore appears dark on all MR images Bone is dense and attenuates the RF pulse, and therefore appears bright on all MR images The hydrogen in cortical bone is too tightly bound to be “excited” by the MR imaging process; therefore, cortical bone appears dark on MR images and “outlines” the vertebral body Bone marrow contains fat and water, and therefore appears bright depending upon the scan parameters used to create the image (surrounded by the “outlining of cortical bone”) c and d None Comment . [On Figure arrow E is pointing to the:] Right vertebral artery Left vertebral artery Right common carotid artery Left common carotid artery Right carotid bifurcation None Comment . [As the TE increases:] SNR increases SNR decreases SNR is not affected by TE TR increases None . [Where would a “central line” catheter be located?] Subclavian vein Brachiocephalic artery Median cubital vein Superior vena cava None . [Collecting the low frequency (high amplitude signal) data points in k-space at the start of the scan (in a spiral fashion) is known as:] Linear Centric Elliptic centric Reverse centric None . [Which blood vessel has the thickest tunica media?] Artery Vein Capillary Lymphatic None . [Discussing a patient’s confidential medical information with a person who does not have a need to know is called:] Vicarious liability Invasion of privacy Misconduct Stare decisis None . [On Figure arrow E is pointing to the:] Cervical spinal cord Conus medularis Cauda equina Esophagus None Comment . [A quench can be used to:] Improve image quality in MRI Rapidly remove superconductivity and the magnetic field Maintain magnetic field homogeneity Satisfy the thirst of the technologist Lubricate the magnet coils None . [On Figure arrow E is pointing to the:] Portal vein Splenic vein Renal vein Superior mesenteric vein Iliac artery None Comment . Time's up
