CT NEURO PROCEDURES

Cards (30)

  • The patient’s head is positioned in the head holder for most protocols of the head.
  • When the head holder is not used, a molded sponge is placed directly on the scan table and the patient’s head is positioned within the sponge
  • The slice angle is determined by the position of the patient’s head (i.e., moving the chin up or down) and the angle of the gantry.
  • using the supraorbital meatal line (also called the glabellomeatal line) to reduce radiation exposure to the lens of the eye
  • axial (step and-shoot) techniques are often used for routine brain imaging
  • the helical CT mode is used mainly for the purpose of generating three- dimensional reformations or to minimize motion-related artifacts.
  • For most applications concerning structural imaging of the brain and skull base, nonenhanced CT is usually adequate.
  • Routine scanning of the neck is typically performed with the patient supine and the neck slightly extended. It is most often performed in the helical mode.
  • The split bolus injection technique is also frequently used for maxillofacial studies in which contrast media is indicated
  • In neck protocols, the total contrast dose is often split in half
  • CT angiography has the advantages of being noninvasive and widely available
  • CT examinations of the spine produce images with inherently high soft tissue contrast. T
  • Proper localization is essential in scanning the spine.
  • Thoracic spine DFOV
    ~16cm
  • IV contrast for CTA Spine
    120 mL at 6mL/s. Scan delay= tracking bolus
  • Window settings for CTA- COW Carotid
    90ww/ 35wl (vertex)
    140 ww/ 40 wl (posterior fossa)
    250 ww/ 30wl (foramen magnum)
  • Window settings for CTV, Neck, cervical, thoracic, lumbar spine, and CTA spine
    350ww/ 50wl
  • IV contrast for orbits
    100 mL at 1.0 mL/s. Split bolus - Two 50mL injection. 2 min. delay
  • IV contrast for sella
    150 mL at 1.0 mL/s. Scan delay: 75s
  • IV CONTRAST FOR CTA-COW
    60 ml at 4.0 mL/s; 20 ml at 4.0 ml/s. Scan delay= from timing bolus (use carotid artery at ~ level of c4 for ROI
  • IV contrast for Neck
    125 mL at 1.5 mL/s: Split bolus 1st inject 50 mL, 2 minute delay, 75 ml for 2nd; 25s scan initiated
  • DFOV for Trauma facial bones
    18 cm
  • DFOV for neck
    18 cm
  • DFOV for brain perfusion
    25 cm
  • DFOV for cervical spine
    ~13
  • DFOV for CTA spine
    20
  • DFOV for Thoracic spine
    ~16
  • DFOV for lumbar spine
    14-16
  • IV contrast for brain perfusion
    50 mL (370 concentration) at 4.0 mL; 20 saline flush mL at 4.0 mL/s- 5s delay
  • IV contrast for CTA-Carotid
    80 ml at 4.0ml/s ;40 at 4.0ml/s=scan delay= from timing bolus