Mobius3D MobiusFX DoseLab TG-142 / DoseLab Pro MedPhys Files
MedPhys Files
   Login or Register
HomeDownloadsRegister
Downloads › ImageJ macro to calculate CT helical slice thickness - new version
Toggle Content Main Menu
 Home Members options Search
Toggle Content User Info

Welcome Anonymous

Nickname
Password

Membership:
Latest: sjmejias
New Today: 0
New Yesterday: 0
Overall: 1025

People Online:
Members: 0
Visitors: 46
Total: 46
Who Is Where:
 Visitors:
01: Site Search
02: External downloads
03: External downloads
04: External downloads
05: Home
06: Downloads
07: Downloads
08: External downloads
09: External downloads
10: Downloads
11: External downloads
12: External downloads
13: Home
14: External downloads
15: Home
16: External downloads
17: Downloads
18: Downloads
19: Downloads
20: Downloads
21: External downloads
22: Downloads
23: Downloads
24: External downloads
25: External downloads
26: External downloads
27: External downloads
28: Downloads
29: Downloads
30: Home
31: External downloads
32: External downloads
33: Downloads
34: Home
35: Downloads
36: External downloads
37: External downloads
38: My Account
39: External downloads
40: Home
41: External downloads
42: Downloads
43: Downloads
44: Downloads
45: Downloads
46: Downloads

Staff Online:

No staff members are online!
ImageJ macro to calculate CT helical slice thickness - new version
Main | Details | Download Now | History | Statistics

Add your mirror to this download

Category Diagnostic Imaging
Submitted by dplatten
Author's Name
David Platten
Distributed with custom license file? No
Published
Mon May 20, 2013 12:03 pm

An ImageJ macro to calculate the helical slice thickness from a CT scan along a rod containing a thin gold disc. The method is based on that used by ImPACT. Note: this macro may not work correctly on a bead embedded in a large phantom.

Expects a directory of DICOM images from a helical scan run through a thin metal disc or a very small metal bead. The reconstruction interval should be around 1/10 of the slice thickness. For example, if the reconstructed slice thickness is 3 mm then you need to set the reconstruction interval to 0.3 mm.

The phantom can be a thin gold disc embedded in a Perspex rod, similar to the one that ImPACT uses. Alternatively the method may work by scanning through a small metal bead, provided that the bead is much smaller than the reconstructed slice thickness. However, the routine may fail with this type of test object as it tries to locate the centre of the test object using a centre-of-mass calculation; this may result in the incorrect positioning of the ROI if the test object occupies the whole image.

For each image in the series the centre of mass of pixels that have a value of >= max / 2 is calculated. A circular ROI is then centred at this position and the mean pixel value calculated. The z-position of the image is recorded. Once all images have been examined, the background is subtracted from every point (actually the minimum mean ROI value), and then the values are normaised to the maximum value. The full-width at half-maximum of the profile is then calculated.

There can be ".txt", ".csv" or "dcminf" files in the directory with your images, but nothing else. Any other file in the directory will cause the routine to fail.


Member reviews

Review #16: Average by darrendemers12 on Thu Aug 13, 2015 8:00 am


ImageJ macro to calculate CT helical slice thickne

The phantom can be a thin gold disc embedded in a Perspex rod, similar to the one that ImPACT uses. Alternatively the method may work by scanning through a small metal bead, provided that the bead is much smaller than the reconstructed slice thickness. However, the routine may fail with this type of test object as it tries to locate the centre of the test object using a centre-of-mass calculation; this may result in the incorrect positioning of the ROI if the test object occupies the whole image.
Get-Your-Nj-Expired-Home-Sold , Homes-For-Sale-In-Springfield , Home-Comob , Home-Nrg , The-Paris-Law-Firm , Paris-Law-Firm , Seza-Law , Derek-Lawless , Explode-Your-Law-Practice
Rating Average
Popularity 1/5: Not popular
Downloads 194
Page views 7247

Download Now
Unless otherwise specified, all files are distributed under the MIT open source license for research and educational use only with no fitness guarantee.
Interactive software released under GNU GPL, Code Credits, Privacy Policy