I am doing internal dosimetry by using OLINDA software and for this, I required injected activity and residence time. THE SPECT/CT planner system was installed in our hospital which gives counts rate now how I am getting activity and residence time from this counts rate. the below picture gets from SPECT/CT system so plz someone understood me that how I get injected activity and residence time from spect/cr planer images.
Dear Asif, may i ask what you try to do here, dosimetry on a renogram is new for me.
Are you intersted in Kidney dose in Lu177 therapy or such? In that case you would need I presume that in case you want to do dosimetry you would derive kidney dose from the post therapy scan.
Anyway you need a sensitivity calibrated camera/collimator combination. A injected dose, and several time points as input. Typically a renogram is not enough for this. Colleagues did point out to ICRP earlier, and there you can find tables of estmated dose for a certain procedure and you will not have to measure.
I have seen Tc work before ( I presume you use 99mTc DTPA) on eg bone scan at 1-6-24 hours.But this again will not apply in kidneys.
I see you are using GE Infinia, may i point out that GE has a Dosimetry program with adjacent workflow (desriptions) for therapuetic isotopes available as a option on Xeleris. Please review that workflow option. Again i suppose this option is also not applicable for Renograms.
I hope the above is of help
Dear Asif,
Maybe I need some clarification about what exactly you need from your images. You said SPECT/CT, but the image attached is a Dynamic image. And, I agree with the previous answer that says Renal Analysis is not the right study to have this information. And about Dosimetry app available in GE, the input can be either WB, Multi SPECT/CT or a combination of both.
Please provide more context so that I can help more.
Regards
PAtricia
Got it! Well, I really don't know a way to get it from just a projection like Dynamic although you need a TAC for sure. Dosimetrix (GE Healthcare) is the SW I use that, based in at least 3 patient images (multi SPECT/CT, WBs or a combination of both), provides me the Residence time which is populated into Olinda to get me the Absorbed Dose. It's a large process since I need to aply several correction to the image so that the final result is as reliable as possible.