MultiSlice CT Short Notes On Clinical Application By Dr' TAREK AHMAD RAAFAT

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Multi-Slice CT Short Notes On Clinical
ApplicationBy Dr. TAREK AHMAD RAAFAT
Ass. Lecturer Radiodiagnosis National Cancer
Institute Cairo University
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• Physical Principles of Multi-Detector CT

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• Multiplied Computed Tomography (MSCT) was
  introduced in the field of radiology in 1998
  resulting in revolution of imaging and addition
  of a new clinical applications.
• The benefits of multi-detector CT relative to
  single-section CT are significant.
• The examination can be done with thinner
  sections, and much faster resulting in improved
  resolution and reducing the motion artifacts.
• MDCT can cover a distance 8 times longer than
  single-slice CT.

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• There are 2 main differences between ordinary
  spiral CT machines and MDCT -

1- It allows the acquisition of multiple axial
images with a single gantry rotation. 2- It has
shorter gantry rotation period making it much
faster.
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Scanning Speed

• MDCT scanners have gantry rotation period of 0.5
  sec, twice the speed of most conventional helical
  scanners.
• Therefore, a MDCT scanner with 4 data channels is
  up to 8 times faster than a conventional
  single-slice CT scanner.

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Clinical Applications

• Multisection CT aquires changes in the planning
  and staging of patient examinations. The scanning
  time is reduced for most examinations, requiring
  adjustments in the administration of intravenous
  contrast material. The amount of contrast
  material can be reduced, and different vascular
  phases can be better visualized. Thin-section
  scanning allows production of high-quality MPR
  images

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•  Coronal reformation image of the right temporal
  bone created from an axial multisection

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• (a) Coronal MPR image clearly shows a pin
  penetrating the posterior subtalar joint
  (arrowheads). (b) Sagittal MPR image clearly
  shows secondary degenerative changes (arrows).
  Streak artifacts are remarkably mild given the
  large amount of steel.

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• Thin-section CT of the hip (a, b) Coronal (a) and
  curved oblique sagittal (b) reformation images
  show fine detail. (c) Lateral surface-rendered
  image shows the acetabulum and femur together.

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•   (a) Coronal maximum-intensity projection image
  shows the sacrum with metal appliances. (b)
  Curved reformation image shows the sacroiliac
  joint surfaces and bone grafts (arrow).

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• (a) Sagittal image shows that the multisection
  acquisition will avoid dental hardware and the
  associated artifacts. (b, c) Coronal (b) and
  sagittal (c) reformation images show
  mucoperiosteal thickening.

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Bone Tumors
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• (a) Sagittal reformation image shows excellent
  bone detail and the outline of the subarachnoid
  space. (b, c) Corrected-axis MPR image (b), which
  was obtained along the dashed line in a, has the
  same spatial resolution as an original axial image

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• Duodenal carcinoma. (a-c) Axial (a), coronal (b),
  and sagittal (c) images show a dilated common
  bile duct (I) and a duodenal neoplasm (arrows).
  (d, e) Lateral arterial-phase (d) and anterior
  venous-phase (e) maximum-intensity projection
  images show normal vessels.

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•   Bilateral carotid artery stenosis. Coronal
  maximum-intensity projection image from CT
  angiography performed from the arch to the skull
  base (1.0-mm section thickness, 19-cm
  longitudinal coverage, 0.5-mm longitudinal
  reconstruction interval) shows severe stenosis of
  the left internal carotid artery (arrow).

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• Renal artery stenosis in a hypertensive patient
  imaged with CT angiography

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• Renal Angiography

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• Endovascular repair of an aortic aneurysm with
  stent-grafts

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• Virtual Endoscopy

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• CT coronary angiography is becoming feasible with
  the availability of faster multisection imaging.

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CONCLUSION

• Multisection CT is superior to single-section
  helical CT for nearly all clinical applications.
  The superior speed of the former can be used to
  improve the temporal, spatial, and contrast
  resolution of the images. In addition,
  multisection CT shows promise for clinical
  applications that were limited or impossible with
  single-section helical CT, such as cardiac
  imaging, organ perfusion studies, and
  examinations of multiple vascular phases. It also
  brings isotropic imaging into the CT domain. CT
  has reached the brink of a new era.