Re: [HCP-Users] contrast in human connectome 3T structural MRI
Thanks a lot for the input. Have you ever noticed whether this technique has a negative influence on the segmentation quality performed on those images? Best regards / Cordialement / De bedste hilsner Jamila Ahdidan PhD, Partner, CSO Brainreader ApS Emil Møllers Gade 41 8700 Horsens - DK tel: +45 5050 5544 <+45%2050%2050%2055%2044> email: jam...@brainreader.net skype: jamila_ahdidan website: www.brainreader.net On Mon, Mar 5, 2018 at 7:46 PM, Glasser, Matthew <glass...@wustl.edu> wrote: > Indeed this contrast mechanism is used to make MR angiograms of the head > without using contrast. > > Peace, > > Matt. > > On 3/5/18, 12:44 PM, "Xu, Junqian" <junqian...@mssm.edu> wrote: > > >Hi Jamila, > > > >These variable bright arteries in the T1w MPRAGE images are probably due > >to the time-of-flight (TOF) effects of those ³fresh" arterial blood > >flowing into the brain after the inverse pulse. > > > >http://mriquestions.com/time-of-flight-effects.html > > > >Regards > >Gordon > > > >> On Mar 5, 2018, at 9:15 AM, Glasser, Matthew <glass...@wustl.edu> > wrote: > >> > >> No gadolinium contrast was used in the HCP. Sometimes blood will > >>appear bright on T1w scans for reasons other than gadolinium contrast. > >> > >> Peace, > >> > >> Matt. > >> > >> From: <hcp-users-boun...@humanconnectome.org> on behalf of Jamila > >>Ahdidan <jam...@brainreader.net> > >> Date: Monday, March 5, 2018 at 2:53 AM > >> To: "hcp-users@humanconnectome.org" <hcp-users@humanconnectome.org> > >> Subject: [HCP-Users] contrast in human connectome 3T structural MRI > >> > >> Hi, > >> > >> I have noticed that many if not all the structural MRIs of the HCP show > >>signs of contrast in the subjects blood. Is that correct? Have you > >>scanned the participants without using contrast as this disturbs the > >>segmentation? > >> > >> Thank you. > >> > >> Best regards / Cordialement / De bedste hilsner > >> > >> Jamila Ahdidan > >> PhD, Partner, CSO > >> Brainreader ApS > >> Emil Møllers Gade 41 > >> 8700 Horsens - DK > >> tel: +45 5050 5544 > >> email: jam...@brainreader.net > >> skype: jamila_ahdidan > >> website: www.brainreader.net > >> ___ > >> HCP-Users mailing list > >> HCP-Users@humanconnectome.org > >> http://lists.humanconnectome.org/mailman/listinfo/hcp-users > >> ___ > >> HCP-Users mailing list > >> HCP-Users@humanconnectome.org > >> http://lists.humanconnectome.org/mailman/listinfo/hcp-users > > > > ___ HCP-Users mailing list HCP-Users@humanconnectome.org http://lists.humanconnectome.org/mailman/listinfo/hcp-users
Re: [HCP-Users] contrast in human connectome 3T structural MRI
Generally not. A bigger issue is not using fat suppression. Peace, Matt. From: Jamila Ahdidan <jam...@brainreader.net<mailto:jam...@brainreader.net>> Date: Tuesday, March 6, 2018 at 3:31 AM To: Matt Glasser <glass...@wustl.edu<mailto:glass...@wustl.edu>> Cc: "Xu, Junqian" <junqian...@mssm.edu<mailto:junqian...@mssm.edu>>, HCP Users <hcp-users@humanconnectome.org<mailto:hcp-users@humanconnectome.org>> Subject: Re: [HCP-Users] contrast in human connectome 3T structural MRI Thanks a lot for the input. Have you ever noticed whether this technique has a negative influence on the segmentation quality performed on those images? Best regards / Cordialement / De bedste hilsner Jamila Ahdidan PhD, Partner, CSO Brainreader ApS Emil Møllers Gade 41 8700 Horsens - DK tel: +45 5050 5544<tel:+45%2050%2050%2055%2044> email: jam...@brainreader.net<mailto:jam...@brainreader.net> skype: jamila_ahdidan website: www.brainreader.net<http://www.brainreader.net/> On Mon, Mar 5, 2018 at 7:46 PM, Glasser, Matthew <glass...@wustl.edu<mailto:glass...@wustl.edu>> wrote: Indeed this contrast mechanism is used to make MR angiograms of the head without using contrast. Peace, Matt. On 3/5/18, 12:44 PM, "Xu, Junqian" <junqian...@mssm.edu<mailto:junqian...@mssm.edu>> wrote: >Hi Jamila, > >These variable bright arteries in the T1w MPRAGE images are probably due >to the time-of-flight (TOF) effects of those ³fresh" arterial blood >flowing into the brain after the inverse pulse. > >http://mriquestions.com/time-of-flight-effects.html > >Regards >Gordon > >> On Mar 5, 2018, at 9:15 AM, Glasser, Matthew >> <glass...@wustl.edu<mailto:glass...@wustl.edu>> wrote: >> >> No gadolinium contrast was used in the HCP. Sometimes blood will >>appear bright on T1w scans for reasons other than gadolinium contrast. >> >> Peace, >> >> Matt. >> >> From: >> <hcp-users-boun...@humanconnectome.org<mailto:hcp-users-boun...@humanconnectome.org>> >> on behalf of Jamila >>Ahdidan <jam...@brainreader.net<mailto:jam...@brainreader.net>> >> Date: Monday, March 5, 2018 at 2:53 AM >> To: "hcp-users@humanconnectome.org<mailto:hcp-users@humanconnectome.org>" >> <hcp-users@humanconnectome.org<mailto:hcp-users@humanconnectome.org>> >> Subject: [HCP-Users] contrast in human connectome 3T structural MRI >> >> Hi, >> >> I have noticed that many if not all the structural MRIs of the HCP show >>signs of contrast in the subjects blood. Is that correct? Have you >>scanned the participants without using contrast as this disturbs the >>segmentation? >> >> Thank you. >> >> Best regards / Cordialement / De bedste hilsner >> >> Jamila Ahdidan >> PhD, Partner, CSO >> Brainreader ApS >> Emil Møllers Gade 41 >> 8700 Horsens - DK >> tel: +45 5050 5544<tel:%2B45%205050%205544> >> email: jam...@brainreader.net<mailto:jam...@brainreader.net> >> skype: jamila_ahdidan >> website: www.brainreader.net<http://www.brainreader.net> >> ___ >> HCP-Users mailing list >> HCP-Users@humanconnectome.org<mailto:HCP-Users@humanconnectome.org> >> http://lists.humanconnectome.org/mailman/listinfo/hcp-users >> ___ >> HCP-Users mailing list >> HCP-Users@humanconnectome.org<mailto:HCP-Users@humanconnectome.org> >> http://lists.humanconnectome.org/mailman/listinfo/hcp-users > ___ HCP-Users mailing list HCP-Users@humanconnectome.org http://lists.humanconnectome.org/mailman/listinfo/hcp-users
Re: [HCP-Users] contrast in human connectome 3T structural MRI
Indeed this contrast mechanism is used to make MR angiograms of the head without using contrast. Peace, Matt. On 3/5/18, 12:44 PM, "Xu, Junqian" <junqian...@mssm.edu> wrote: >Hi Jamila, > >These variable bright arteries in the T1w MPRAGE images are probably due >to the time-of-flight (TOF) effects of those ³fresh" arterial blood >flowing into the brain after the inverse pulse. > >http://mriquestions.com/time-of-flight-effects.html > >Regards >Gordon > >> On Mar 5, 2018, at 9:15 AM, Glasser, Matthew <glass...@wustl.edu> wrote: >> >> No gadolinium contrast was used in the HCP. Sometimes blood will >>appear bright on T1w scans for reasons other than gadolinium contrast. >> >> Peace, >> >> Matt. >> >> From: <hcp-users-boun...@humanconnectome.org> on behalf of Jamila >>Ahdidan <jam...@brainreader.net> >> Date: Monday, March 5, 2018 at 2:53 AM >> To: "hcp-users@humanconnectome.org" <hcp-users@humanconnectome.org> >> Subject: [HCP-Users] contrast in human connectome 3T structural MRI >> >> Hi, >> >> I have noticed that many if not all the structural MRIs of the HCP show >>signs of contrast in the subjects blood. Is that correct? Have you >>scanned the participants without using contrast as this disturbs the >>segmentation? >> >> Thank you. >> >> Best regards / Cordialement / De bedste hilsner >> >> Jamila Ahdidan >> PhD, Partner, CSO >> Brainreader ApS >> Emil Møllers Gade 41 >> 8700 Horsens - DK >> tel: +45 5050 5544 >> email: jam...@brainreader.net >> skype: jamila_ahdidan >> website: www.brainreader.net >> ___ >> HCP-Users mailing list >> HCP-Users@humanconnectome.org >> http://lists.humanconnectome.org/mailman/listinfo/hcp-users >> ___ >> HCP-Users mailing list >> HCP-Users@humanconnectome.org >> http://lists.humanconnectome.org/mailman/listinfo/hcp-users > ___ HCP-Users mailing list HCP-Users@humanconnectome.org http://lists.humanconnectome.org/mailman/listinfo/hcp-users
Re: [HCP-Users] contrast in human connectome 3T structural MRI
Hi Jamila, These variable bright arteries in the T1w MPRAGE images are probably due to the time-of-flight (TOF) effects of those “fresh" arterial blood flowing into the brain after the inverse pulse. http://mriquestions.com/time-of-flight-effects.html Regards Gordon > On Mar 5, 2018, at 9:15 AM, Glasser, Matthew <glass...@wustl.edu> wrote: > > No gadolinium contrast was used in the HCP. Sometimes blood will appear > bright on T1w scans for reasons other than gadolinium contrast. > > Peace, > > Matt. > > From: <hcp-users-boun...@humanconnectome.org> on behalf of Jamila Ahdidan > <jam...@brainreader.net> > Date: Monday, March 5, 2018 at 2:53 AM > To: "hcp-users@humanconnectome.org" <hcp-users@humanconnectome.org> > Subject: [HCP-Users] contrast in human connectome 3T structural MRI > > Hi, > > I have noticed that many if not all the structural MRIs of the HCP show signs > of contrast in the subjects blood. Is that correct? Have you scanned the > participants without using contrast as this disturbs the segmentation? > > Thank you. > > Best regards / Cordialement / De bedste hilsner > > Jamila Ahdidan > PhD, Partner, CSO > Brainreader ApS > Emil Møllers Gade 41 > 8700 Horsens - DK > tel: +45 5050 5544 > email: jam...@brainreader.net > skype: jamila_ahdidan > website: www.brainreader.net > ___ > HCP-Users mailing list > HCP-Users@humanconnectome.org > http://lists.humanconnectome.org/mailman/listinfo/hcp-users > ___ > HCP-Users mailing list > HCP-Users@humanconnectome.org > http://lists.humanconnectome.org/mailman/listinfo/hcp-users ___ HCP-Users mailing list HCP-Users@humanconnectome.org http://lists.humanconnectome.org/mailman/listinfo/hcp-users
Re: [HCP-Users] contrast in human connectome 3T structural MRI
No gadolinium contrast was used in the HCP. Sometimes blood will appear bright on T1w scans for reasons other than gadolinium contrast. Peace, Matt. From: <hcp-users-boun...@humanconnectome.org<mailto:hcp-users-boun...@humanconnectome.org>> on behalf of Jamila Ahdidan <jam...@brainreader.net<mailto:jam...@brainreader.net>> Date: Monday, March 5, 2018 at 2:53 AM To: "hcp-users@humanconnectome.org<mailto:hcp-users@humanconnectome.org>" <hcp-users@humanconnectome.org<mailto:hcp-users@humanconnectome.org>> Subject: [HCP-Users] contrast in human connectome 3T structural MRI Hi, I have noticed that many if not all the structural MRIs of the HCP show signs of contrast in the subjects blood. Is that correct? Have you scanned the participants without using contrast as this disturbs the segmentation? Thank you. Best regards / Cordialement / De bedste hilsner Jamila Ahdidan PhD, Partner, CSO Brainreader ApS Emil Møllers Gade 41 8700 Horsens - DK tel: +45 5050 5544<tel:+45%2050%2050%2055%2044> email: jam...@brainreader.net<mailto:jam...@brainreader.net> skype: jamila_ahdidan website: www.brainreader.net<http://www.brainreader.net/> ___ HCP-Users mailing list HCP-Users@humanconnectome.org<mailto:HCP-Users@humanconnectome.org> http://lists.humanconnectome.org/mailman/listinfo/hcp-users ___ HCP-Users mailing list HCP-Users@humanconnectome.org http://lists.humanconnectome.org/mailman/listinfo/hcp-users
[HCP-Users] contrast in human connectome 3T structural MRI
Hi, I have noticed that many if not all the structural MRIs of the HCP show signs of contrast in the subjects blood. Is that correct? Have you scanned the participants without using contrast as this disturbs the segmentation? Thank you. Best regards / Cordialement / De bedste hilsner Jamila Ahdidan PhD, Partner, CSO Brainreader ApS Emil Møllers Gade 41 8700 Horsens - DK tel: +45 5050 5544 <+45%2050%2050%2055%2044> email: jam...@brainreader.net skype: jamila_ahdidan website: www.brainreader.net ___ HCP-Users mailing list HCP-Users@humanconnectome.org http://lists.humanconnectome.org/mailman/listinfo/hcp-users
