Review for anatomy and common acute conditions
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This document provides an overview of brain CT scans, including normal anatomy and common acute conditions. It discusses basic CT principles like Hounsfield units and how tissues appear based on their density. Key parts of normal anatomy like the falx cerebri are highlighted. Regarding acute conditions, it summarizes the appearance of ischemic strokes over time, noting subtle early signs and more prominent low attenuation areas later. It also describes subdural and epidural hematomas, noting subdural bleeds are usually venous while epidural bleeds come from torn meningeal arteries.
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Review for anatomy and common acute conditions
- 1. DR Mohammad Aburumman Arab Board OF RADIOLOGY - Fellow of I.R
- 2. BRAIN CT SCAN PART I REVIEW FOR ANATOMY AND Common acute conditions for clinician
- 3. SCHEME OF THE LECTURE BASIC PRINCIPLES OF CT SCAN NORMAL ANATOMY AS SEEN ON CRANIUM CT SCANS ILLUSTRATIONS
- 4. Basics : • X-RAYS ARE ABSORBED DIFFERENTLY BY DIFFERENT TISSUES • Always describe CT findings as densities- isodense/hypodense/hyperdense. • Higher density = the appearance IS WHITER • Lower density = the appearance IS DARKER • Brain is the reference density • Anything of the density as brain= isodense • Higher density than brain= hyperdense ( BONE is example) • Anything darker than brain= hypodense( ie. CSF and air )
- 5. HOUNSFIELD UNITS H.U ? ! Represent the density of tissue Calculated automatically by Ct scan machine processor by Place the marker on area of interest
- 9. 30 H.U
- 10. 45 H.U
- 11. 1000 H.U
- 22. FALX CEREBELLI
- 23. FALX CEREBELLI
- 25. STROKE
- 27. I schaemic Stroke 1 st 6 Hours : 60% Normal Vogue subtle Hypodensity . Sulcal effacment Loss of Grey/White matter Distinction ... 12-24 More prominant low attenuated area .
- 28. Ischaemic Stroke After 24 hours Well demarcated low attenuation . 3-5 days Mass effect which may gone by 2-4 weeks . LongTerm Encephalomalcia
- 31. IS CONTRAST NECESSARY ??
- 33. Sub Dural and Epidural Hematoma Usually traumatic >>> Subdural Venous bleed due to stretching and tearing of bridging cortica
- 34. Epidural Arterial bleed The source of bleeding is usually a torn meningeal artery (most commonly, the middle meningeal artery) meningeal artery. Skull Fracture . >95% are supratentorial temporoparietal: 60%
- 36. EDH
- 37. S.A.H
- 38. TO BE CONTINUE
- 39. THANKYOU