HRCT THORAX

Last Updated on June 23, 2022 by Muhamad Aiman Aqil

Anatomy of Thorax, Abdomen and Pelvis

Image taken from Microbe Notes

Appearance of HRCT Thorax Images

Auto scroll of CT TAP image in axial cut.

Examination Overview

Protocol Structure

00_ThoraxHRCT

  • Topogram
  • Non contrast – Inspiration (upper shoulder to iliac crest)
  • Thorax Expiration Upper (arch of aorta)
  • Thorax Expiration Middle (carina of trachea)
  • Thorax Expiration Lower (middle of heart)

Topogram

  • Position the patient in head first supine position.
  • Align the patient in Mid-Sagittal plane of the table.
  • Position the transverse laser light beam at the level of patient’s upper shoulder to start the topogram.

Topogram Parameters

  • Topogram length: 512 mm
  • Slice: 0.6 mm
  • Scanning direction: Craniocoudal
  • Tube position: Top
  • Stop the topogram scanning when the scanning reach / pass over the iliac crest.

Non Contrast - Inspiration

  • Plan the Scan FOV (SFOV) box at topogram image
  • Set the top line at the level of upper shoulder
  • Set the bottom line at the level of iliac crest.
  • Ensure the lateral line to cover patient’s body outline.
  • Remind the patient before scanning as the breathing instruction will be given.

Scanning Parameters

  • kV: 100 kV
  • mAs: Tube Current Modulation (TCM)
  • Scanning Direction: Craniocaudal
  • Scan Delay: 4 s
  • Slice: 5.0mm
  • Image Comment: Pre-Contrast
  • Pitch: 0.6
  • Quality Reference mAs : 230

Reconstruction of HRCT Non Contrast - Inspiration

Recon 1Recon 2Recon 3Recon 4
NameThorax HR 5.0 B80fThorHR 5.0 B31fThorHR 1.0 B70fThorHR 1.0 B31f
Slice Thickness5.0 mm5.0 mm1.0 mm1.0 mm
Increment5.0 mm5.0 mm0.7 mm0.7 mm
KernelB80f ultra sharpB31f medium smoothB70f very sharpB31f medium smooth
WindowingLungMediastinumLungMediastinum

Thorax HRCT Expiration Scan Planning

Thorax Expiration Upper

  • Plan the Scan FOV (SFOV) box at topogram image.
  • Set the single line at the level arch of aorta.
  • Remind the patient before scanning as the breathing instruction will be given.

.

Thorax Expiration Middle

  • Plan the Scan FOV (SFOV) box at topogram image.
  • Set the single line at the level carina of trachea.

Thorax Expiration Lower

  • Plan the Scan FOV (SFOV) box at topogram image.
  • Set the single line at the level middle of heart.

Reconstruction of Thorax Expiration Upper, Middle and Lower

Recon 1
NameThorExpUpper 1.0 B70s / ThorExpMiddle 1.0 B70s / ThorExpLower 1.0 B70s
Slice Thickness1.0 mm
IncrementN/A
KernelB70s very sharp
WindowingLung

Series of Images Send to PACS

  1. Topogram
  2. ThorHR 5.0 B80f
  3. ThorHR 5.0 B31f
  4. ThorHR 1.0 B70f
  5. ThorHR 1.0 B31f
  6. ThorExpUpper 1.0 B70s
  7. ThorExpMiddle 1.0 B70s
  8. ThorExpLower 1.0 B70s
  9. Patient Protocol
 

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