Difference between revisions of "CT"

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==Scrollable high-resolution computed tomography images of a normal thorax==
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{{Top
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Following are [[:en:High-resolution computed tomography|high-resolution computed tomographs]] of a normal [[:en:thorax|thorax]] (except for some mild degenerative changes in the vertebral column) of a 37 year old man who presented with unspecific breathing problems, published with written informed consent. They are taken in the [[:en:Axial plane|axial]], [[:en:Coronal plane|coronal]] and [[:en:sagittal|sagittal planes]], respectively. The slice thickness of 3 mm in this presentation is a bit thicker than a standard HRCT. To move through the images, hover over the image and use [[:en:Scroll wheel|scroll wheel]], drag the mouse over the image, or click the < or the > above each stack. This functionality should activate when the page is fully loaded, which may take some time. While scrolling, there may be flickering the first time each image appears in the stack.
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|author1=[[User:Mikael Häggström|Mikael Häggström]]
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|author2=
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}}
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==By location==
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<gallery>
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File:Computed_tomography_of_human_brain_(5)_-_local.jpg|link=CT of the head|[[CT of the head|CT of the '''head''']]
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File:High-resolution_computed_tomograph_of_a_normal_thorax,_axial_plane_(49).jpg|link=CT of the thorax|[[CT of the thorax|CT of the '''thorax''']]
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File:Enlarged gallbladder with gallstone and cholecystitis.jpg|link=CT of the abdomen and pelvis|[[CT of the abdomen and pelvis|CT of the '''abdomen and pelvis''']]
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</gallery>
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*[[Aorta]]
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:*[[CT of the aorta]]
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==With contrast==
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*[[Contrast CT]]
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==General planning==
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Upon receiving a referral for a CT, generally check:
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*'''Who''' is the ordering individual?
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*'''Where''': From which unit or department?
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*'''Requested''' investigation
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*'''Targets''': Suspected diseases or other questions or requests
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*Patient '''history'''
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:*Possible earlier imaging that can already answer the questions?
  
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{{Imagestack
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Consider if another modality is better for the questions at hand.
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|width=700
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|title=[[:en:Axial plane|Axial plane]]
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Choose the proper CT settings
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|align=left
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*[[Contrast CT]] and/or non-contrast.
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|background=#b8b878
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*Include thin slices (0.5 to 1.5 mm)<ref name="MaetaniNamiki2016">{{cite journal|last1=Maetani|first1=Kazuhide|last2=Namiki|first2=Jun|last3=Matsumoto|first3=Shokei|last4=Matsunami|first4=Katsutoshi|last5=Narumi|first5=Atsushi|last6=Tsuneyoshi|first6=Toshimi|last7=Kishikawa|first7=Masanobu|title=Routine Head Computed Tomography for Patients in the Emergency Room with Trauma Requires Both Thick- and Thin-Slice Images|journal=Emergency Medicine International|volume=2016|year=2016|pages=1–4|issn=2090-2840|doi=10.1155/2016/5781790}}</ref> if the skeleton needs to be evaluated.
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|loop=yes
 
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|File:High-resolution computed tomograph of a normal thorax, axial plane (1).jpg|
 
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|File:High-resolution computed tomograph of a normal thorax, axial plane (2).jpg|
 
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|File:High-resolution computed tomograph of a normal thorax, axial plane (3).jpg|
 
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|File:High-resolution computed tomograph of a normal thorax, axial plane (4).jpg|
 
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|File:High-resolution computed tomograph of a normal thorax, axial plane (5).jpg|
 
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|File:High-resolution computed tomograph of a normal thorax, axial plane (6).jpg|
 
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|File:High-resolution computed tomograph of a normal thorax, axial plane (7).jpg|
 
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|File:High-resolution computed tomograph of a normal thorax, axial plane (8).jpg|
 
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|File:High-resolution computed tomograph of a normal thorax, axial plane (9).jpg|
 
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|File:High-resolution computed tomograph of a normal thorax, axial plane (10).jpg|
 
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|File:High-resolution computed tomograph of a normal thorax, axial plane (11).jpg|
 
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|File:High-resolution computed tomograph of a normal thorax, axial plane (12).jpg|
 
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|File:High-resolution computed tomograph of a normal thorax, axial plane (47).jpg|
 
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|File:High-resolution computed tomograph of a normal thorax, axial plane (48).jpg|
 
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|File:High-resolution computed tomograph of a normal thorax, axial plane (49).jpg|
 
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}}
 
  
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{{Imagestack
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==General post-imaging approach==
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|width=700
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*Check the order form
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|title=[[:en:Coronal plane|Coronal plane]]
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:*'''Who''' is the ordering individual?
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|align=left
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:*'''Where''': From which unit or department?
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|background=#b8b878
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:*Patient '''history'''
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|loop=yes
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:*'''Requested''' investigation
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|File:High-resolution computed tomograph of a normal thorax, coronal plane (1).jpg|
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:*'''Targets''':  
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|File:High-resolution computed tomograph of a normal thorax, coronal plane (2).jpg|
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*'''Earlier''' investigations, and their findings
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|File:High-resolution computed tomograph of a normal thorax, coronal plane (3).jpg|
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*'''Examine''' the images at hand, including:
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|File:High-resolution computed tomograph of a normal thorax, coronal plane (4).jpg|
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:*'''Requested targets''' from the referral, or suspected diseases or other questions
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|File:High-resolution computed tomograph of a normal thorax, coronal plane (5).jpg|
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:*'''Basic screening''', whose targets vary with mainly anatomic location (see [[#Locations|locations above]]), but broadly include:
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|File:High-resolution computed tomograph of a normal thorax, coronal plane (6).jpg|
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::*'''Soft tissues''', mainly for tumors or other expansions such as hematomas (see [[CT of muscle hematoma]])
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|File:High-resolution computed tomograph of a normal thorax, coronal plane (7).jpg|
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::*'''Skeleton''', mainly for fractures (see [[CT of fractures]] and tumors (see [[CT of bone tumors]]).
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|File:High-resolution computed tomograph of a normal thorax, coronal plane (8).jpg|
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*'''Complement''' with reconstructions where needed, such as volume renderings or thinner slices.
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|File:High-resolution computed tomograph of a normal thorax, coronal plane (9).jpg|
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*'''Write''' report {{Reporting}}
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|File:High-resolution computed tomograph of a normal thorax, coronal plane (10).jpg|
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Finally, check one extra time if the reply corresponds to the '''targets''' at hand.
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|File:High-resolution computed tomograph of a normal thorax, coronal plane (11).jpg|
 
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|File:High-resolution computed tomograph of a normal thorax, coronal plane (12).jpg|
 
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|File:High-resolution computed tomograph of a normal thorax, coronal plane (13).jpg|
 
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|File:High-resolution computed tomograph of a normal thorax, coronal plane (14).jpg|
 
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|File:High-resolution computed tomograph of a normal thorax, coronal plane (15).jpg|
 
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|File:High-resolution computed tomograph of a normal thorax, coronal plane (16).jpg|
 
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|File:High-resolution computed tomograph of a normal thorax, coronal plane (17).jpg|
 
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|File:High-resolution computed tomograph of a normal thorax, coronal plane (18).jpg|
 
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|File:High-resolution computed tomograph of a normal thorax, coronal plane (19).jpg|
 
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|File:High-resolution computed tomograph of a normal thorax, coronal plane (20).jpg|
 
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|File:High-resolution computed tomograph of a normal thorax, coronal plane (47).jpg|
 
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|File:High-resolution computed tomograph of a normal thorax, coronal plane (48).jpg|
 
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|File:High-resolution computed tomograph of a normal thorax, coronal plane (49).jpg|
 
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|File:High-resolution computed tomograph of a normal thorax, coronal plane (54).jpg|
 
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|File:High-resolution computed tomograph of a normal thorax, coronal plane (66).jpg|
 
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|File:High-resolution computed tomograph of a normal thorax, coronal plane (67).jpg|
 
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}}
 
  
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{{Imagestack
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==Hounsfield scale==
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|width=700
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*[[Hounsfield scale]]
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|title=[[:en:Sagittal plane|Sagittal plane]]
 
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|align=left
 
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|background=#b8b878
 
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|loop=yes
 
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|File:High-resolution computed tomograph of a normal thorax, sagittal plane (3).jpg|
 
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[[Category:High-resolution computed tomography images of normal thorax]]
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==Location-unspecific diseases==
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*[[CT of cancer|CT of '''cancer''']]
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{{Bottom}}

Latest revision as of 15:43, 25 March 2019

Author: Mikael Häggström [notes 1]

By location

With contrast

General planning

Upon receiving a referral for a CT, generally check:

  • Who is the ordering individual?
  • Where: From which unit or department?
  • Requested investigation
  • Targets: Suspected diseases or other questions or requests
  • Patient history
  • Possible earlier imaging that can already answer the questions?

Consider if another modality is better for the questions at hand.

Choose the proper CT settings

  • Contrast CT and/or non-contrast.
  • Include thin slices (0.5 to 1.5 mm)[1] if the skeleton needs to be evaluated.

General post-imaging approach

  • Check the order form
  • Who is the ordering individual?
  • Where: From which unit or department?
  • Patient history
  • Requested investigation
  • Targets:
  • Earlier investigations, and their findings
  • Examine the images at hand, including:
  • Requested targets from the referral, or suspected diseases or other questions
  • Basic screening, whose targets vary with mainly anatomic location (see locations above), but broadly include:
  • Complement with reconstructions where needed, such as volume renderings or thinner slices.
  • Write report
See also: General notes on reporting

Finally, check one extra time if the reply corresponds to the targets at hand.

Hounsfield scale

Location-unspecific diseases

Notes

  1. ↑ For a full list of contributors, see article history. Creators of images are attributed at the image description pages, seen by clicking on the images. See Radlines:Authorship for details.

References

  1. ↑ Maetani, Kazuhide; Namiki, Jun; Matsumoto, Shokei; Matsunami, Katsutoshi; Narumi, Atsushi; Tsuneyoshi, Toshimi; Kishikawa, Masanobu (2016). "Routine Head Computed Tomography for Patients in the Emergency Room with Trauma Requires Both Thick- and Thin-Slice Images ". Emergency Medicine International 2016: 1–4. doi:10.1155/2016/5781790. ISSN 2090-2840. 
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