[MINC-users] dcm2mnc & frames times

[Robert D. Vincent]

Hi  Jérôme,

It could well be that these are the numbers recorded in the DICOM files - I
should probably take a look at the series. If you send me a link I'll try
to check it.

    -bert

On Fri, Sep 7, 2018 at 10:08 AM Jérôme Redouté <redoute at cermep.fr> wrote:

> Hello all,
>
> we have noticed that frames times for dynamic PET volumes from our
> Siemens PET scanner are strangely extracted during dcm2mnc conversion:
>
> here is an example of the time variable given by mincinfo:
>
> > -0.021253439619000346478
> > 29.978746560380997721
> > 59.978746560380997721
> > 89.97874656037998875
> > 119.91498685595000495
> > 179.91498685594999074
> > 239.91498685594996232
> > 299.91498685594996232
> > 359.91498685594996232
> > 419.91498685594996232
> > 479.23494067776994143
> > 659.23494067776994143
> > 839.23494067776994143
> > 1019.2349406777999548
> > 1199.2349406778000684
> > 1379.2349406778000684
> > 1559.2349406778000684
> > 1739.2349406778000684
> > 1919.2349406778000684
> > 2097.8751627063998058
> > 2397.8751627063998058
> > 2697.8751627063998058
> > 2997.8751627063998058
> > 3297.8751627063998058
> > 3597.8751627063998058
> > 3897.8751627063998058
> > 4197.8751627064002605
> > 4497.8751627064002605
> > 4797.8751627064002605
> > 5097.8751627064002605
>
> of course we expect integers!
>
> we can try to correct this in our processing scripts, but you can notice
> that for the 10th frame, removing the decimal part leads to an error of
> 1 sec ...
>
> > 8th: 299.91498685594996232 => 300 to 360 (60 sec duration)
> > 9th: 359.91498685594996232 => 360 to 420
> > 10th: 419.91498685594996232 => 420 to *480*
> > 11th: 479.23494067776994143 => *479 to 549*
>
> Any ideas?
>
> I can provide a dataset for testing if you need
>
> Thanks
>
> Jerome
>
>
> --
> ==================================================================
> Jérôme Redouté
> Ph.D. - Ingénieur de Recherche - Université Claude Bernard - Lyon1
> Responsable imageur TEP-TDM
> CERMEP - Imagerie du vivant
> 59 Bd Pinel. 69677 Bron - FRANCE
> tel : 33 (0)4 72 68 86 18 (bureau)
> tel : 33 (0)4 72 68 86 00 (standard)
> fax : 33 (0)4 72 68 86 10
> ==================================================================
>
> _______________________________________________
> MINC-users at bic.mni.mcgill.ca
> http://www.bic.mni.mcgill.ca/mailman/listinfo/minc-users
>