# PET - ordering in LUT **URL:** \ **Category:** General Discussions\ **Created:** [October 26, 2022, 10:41am UTC](https://castor-project.discourse.group/t/pet-ordering-in-lut/428 "2022-10-26T10:41:21Z")\ **Posts on this page:** 1\ **Showing post:** 4
**Author:** ![tmerlin](https://yyz2.discourse-cdn.com/free1/user_avatar/castor-project.discourse.group/tmerlin/32/216_2.png) [@tmerlin](https://castor-project.discourse.group/u/tmerlin)\ **Post date:** [October 27, 2022, 5:19pm UTC](https://castor-project.discourse.group/t/pet-ordering-in-lut/428/4 "2022-10-27T17:19:31Z")
Be careful with Amide, some recent version had issues with endianess lately and I would double check the raw image if you have very erratic values. See [3] below: > [@Reading Interfile with ImageJ](https://castor-project.discourse.group/t/reading-interfile-with-imagej/259): > > Greetings, In the CASToR website, it is indicated that Interfile can be opened with ImageJ by using the NucMed plugin [1]. However, I can’t seems to find this plugin. The closest I found was MedNuc [2], but it doesn’t seems to mention that it can open Interfile. I did install its 8 plugins just to make sure, but I didn’t found an option for loading Interfile. Can anyone tell me where to find this plugin or if it is really in MedNuc? (I hope I am not blind!) I can open directly the \*.img as Raw… With a LUT the indexing doesn’t matter, you could choose to randomly shuffle the detector index and you should get the same sensitivity image as computed from geometry. However it is true the aspect of this image will depend on your geometry, but if your positions seems correct I would not expect such noisy output except maybe if the number of detectors if very low. Of course you can generate your own dataset and feed it to CASToR as a normalization datafile with the proper data channels (with or without correction factor) and give it to CASToR to generate the sensitivity image. This should actually be better than computing from geometry. Best, Thibaut --- _[View the full topic](https://castor-project.discourse.group/t/pet-ordering-in-lut/428)._