头颅损伤CT片阅读技巧.docx
- 文档编号:2819375
- 上传时间:2022-11-15
- 格式:DOCX
- 页数:10
- 大小:1.08MB
头颅损伤CT片阅读技巧.docx
《头颅损伤CT片阅读技巧.docx》由会员分享,可在线阅读,更多相关《头颅损伤CT片阅读技巧.docx(10页珍藏版)》请在冰豆网上搜索。
头颅损伤CT片阅读技巧
HowtoreadaheadCT
ThemnemonicusedbyDr.AndrewPerronwholecturesonthistopicfrequentlyis:
BloodCanBeVeryBad.Contentandimagesbelowaretakenfromhislecture(withhispermission).
Thisstandsfor
B-blood
C-cisterns
B-brain
V-ventricles
B-bones
Step:
1blood
LookforanyevidenceofbleedingthroughoutallslicesoftheheadCT.
Bloodwillappearbrightwhiteandistypicallyintherangeof50-100Houndsfieldunits.
Basiccategoriesofbloodinthebrainareepidural,subdural,intraparenchymal/intracerebral,intraventricular,andsubarachnoid.
Epidural(lensshaped,doesnotcrosssuturelines)
Subdural(crescentshaped,doescrosssuturelines)
Intraparenchymal/intracerbralhemorrhage(highdensitybleedsmostofteninthebasalgangliaareaifduetoHTN)
Intraventricularhemorrhage
Subarachnoidhemorrhage(duemostoftentoaneurysms,CTsensitivitydecreasessharplywithtime)
Step:
2cisterns
2Keyquestionstoanswerregardingthe4keycisterns(Circummesencephalic,Suprasellar,QuadrigeminalandSylvian)
-Isthereblood?
-Arethecisternsopen?
Circummesencephaliccistern
Suprasellarcistern
Quadrigeminalcistern
Sylviancistern
Step:
3brain
Examinethebrainfor
Symmetry-makesuresulciandgyriappearthesameonbothsides.(easiestwhenpatientnotrotatedinthescanner)
Grey-whitedifferentiation-theearliestsignofaCVAonCTscanisthelossofthegrey-whiteinterfaceonCTscan.Comparesidetoside.
Shift-thefalxshouldbeinthemidlinewithventriclesthesameonbothsides.Checkforeffacementofsulci(unilateralorbilateral).
Hyper/hypodenisty-blood,calcificationandIVcontrastarehyperdense(appearlighter)andair,fatandareasoftumorischemiaarehypodense(appeardarker).
Step:
4ventricles
ExamineforIIIrd,IVthandlateralventriclesfordilationorcompression/shift.
Pathologicprocessescausedilation(hydrocephalus)orcompression/shift.Communicatingvs.Non-communicating.Communicatinghydrocephalusisfirstevidentindilationofthetemporalhorns(normallysmall,slit-like).Thelateral,IIIrd,andIVthventriclesneedtobeexaminedforeffacement,shift,andblood.
Step:
5bone
BonehasthehighestdensityonCTscan(whitestinappearance.)Evaluateforfracture.
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 头颅 损伤 CT 阅读 技巧