You received this message because you are subscribed to a topic in the Google Groups "Plastimatch" group.
To unsubscribe from this topic, visit https://groups.google.com/d/topic/plastimatch/lhhqjwN_X18/unsubscribe.
To unsubscribe from this group and all its topics, send an email to plastimatch...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/plastimatch/BL0PR04MB459324351B484686FF20CF2ACF3C9%40BL0PR04MB4593.namprd04.prod.outlook.com.
You received this message because you are subscribed to a topic in the Google Groups "Plastimatch" group.
To unsubscribe from this topic, visit https://groups.google.com/d/topic/plastimatch/lhhqjwN_X18/unsubscribe.
To unsubscribe from this group and all its topics, send an email to plastimatch...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/plastimatch/BL0PR04MB459324351B484686FF20CF2ACF3C9%40BL0PR04MB4593.namprd04.prod.outlook.com.
Hi Andrew,
I expect no difference in resolution.
The adjust command creates an output image with the same resolution as the input image. There is one exception though, when converting images that have irregular slice spacing. You can check the resolution like follows:
plastimatch header --input adjusted.mha
plastimatch header --input DICOM/
The adjust command will convert the volume from integer to floating point as well, but I doubt that is harming things. You could check this by doing a "null" adjustment:
plastimatch adjust --pw-linear "0,0" # If you don't specify the -inf/inf parts the slope is 1
And then compare the DRR output with the original.
I'm not familiar with the Slicer UI. It is possible they are doing something clever like oversampling the volume. But I consider it more likely that some useful anatomic features are being set to -1000 and not showing up. If so, this is not easy to correct. It does make sense that the adjusted DRR is noisier due to fewer voxels being used in each ray.
Let me know what you find out.
Greg
From: plast...@googlegroups.com <plast...@googlegroups.com>
On Behalf Of Andrew Fields
Sent: Wednesday, November 09, 2022 2:31 PM
To: plast...@googlegroups.com
Subject: Re: [Plastimatch] Thresholding .mha Before DRR Generation
External Email - Use Caution
Hi Greg,
I have a follow-up question about using the Adjust command. It seems like applying Adjust decreases the resolution of a downstream DRR (more pixelation, less definition of anatomical contours). See example below. The image on the left is a DRR generated from an .mha that was created directly from a .dcm series. The image on the right is a DRR generated from an .mha that is a modified version of the initial .mha.
To unsubscribe from this group and stop receiving emails from it, send an email to
plastimatch...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/plastimatch/CAARQgai0aeQqqizDGZZ11rxaowqjd_AXrWgg7E%2Bk1DE4dynaUw%40mail.gmail.com.
The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Mass General Brigham Compliance HelpLine at https://www.massgeneralbrigham.org/complianceline .