Subject: Re: Any recommendation for MR-compatible insert earphones? From: Nike gnanateja <nikegnanateja@xxxxxxxx> Date: Tue, 20 Oct 2015 22:38:08 +0530 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>--001a113d67727bfcc405228c4f07 Content-Type: text/plain; charset=UTF-8 Hi Julien, I cam across this insert ear phone recently. I think this should serve your purpose. It has 20ft long tubes which will place the transducers quite far away from the scanner. Model : ER-30 URL : http://www.etymotic.com/auditory-research/insert-earphones-for-special-uses/er30.html Regards, Nike On Mon, Oct 19, 2015 at 9:58 PM, julienbesle <julienbesle@xxxxxxxx> wrote: > Hello list > > We're looking to replace our MR-compatible acoustic stimulation system and > are looking for some advice . > We currently use a Nordic Neurolab electrostatic Earphone system. It is > working fine and in particular the frequency trasnfer function is flat > enough (not as flat as advertised though). However a major drawback for us > is that the inserts themselves are made of hard material, are quite bulky > and stick out of the subject's ears. We use a fairly narrow headcoil and > for subjects with a large head, the inserts couple with the coil and > amplify the gradient noise for the subject. In practice, this places a > limit on the head width of the subjects we can recruit and at the moment we > are limited to recruiting subjects whose head is less than 14 cm wide, > which excludes most males and a large number of females. > > Does anyone has any experience with other MR-compatible insert systems and > could provide advice, in particular with respect to: > - the flatness of the transfer function > - how much space the inserts take, whether they are made of hard material > and how much they stick out of the subject's ears > - any other desirable or undesirable features > > Thanks in advance > > Julien > > -- > ------------------------------------- > Julien Besle > Senior Investigator Scientist > MRC Institute of Hearing Research > University Park > Nottingham NG7 2RD > United Kingdom > > tel: +44 (0)115 951 8508 Ext 209 > ------------------------------------- > -- G Nike Gnanateja, MSc (Audiology) <http://goog_636235333> Junior Research Fellow, Department of Audiology, All India Institute of Speech and Hearing Mysore-06 --001a113d67727bfcc405228c4f07 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr"><div><div><div><div><div>Hi Julien, <br><br></div>I cam ac= ross this insert ear phone recently. I think this should serve your purpose= . It has 20ft long tubes which will place the transducers quite far away fr= om the scanner.<br></div>Model : ER-30 <br></div>URL : <a href=3D"http://ww= w.etymotic.com/auditory-research/insert-earphones-for-special-uses/er30.htm= l">http://www.etymotic.com/auditory-research/insert-earphones-for-special-u= ses/er30.html</a><br><br><br></div>Regards, <br><br></div>Nike<br></div><di= v class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Mon, Oct 19, 2015= at 9:58 PM, julienbesle <span dir=3D"ltr"><<a href=3D"mailto:julienbesl= e@xxxxxxxx" target=3D"_blank">julienbesle@xxxxxxxx</a>></span> wrote:<= br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left= :1px #ccc solid;padding-left:1ex">Hello list<br> <br> We're looking to replace our MR-compatible acoustic stimulation system = and are looking for some advice .<br> We currently use a Nordic Neurolab electrostatic Earphone system. It is wor= king fine and in particular the frequency trasnfer function is flat enough = (not as flat as advertised though). However a major drawback for us is that= the inserts themselves are made of hard material, are quite bulky and stic= k out of the subject's ears. We use a fairly narrow headcoil and for su= bjects with a large head, the inserts couple with the coil and amplify the = gradient noise for the subject. In practice, this places a limit on the hea= d width of the subjects we can recruit and at the moment we are limited to = recruiting subjects whose head is less than 14 cm wide, which excludes most= males and a large number of females.<br> <br> Does anyone has any experience with other MR-compatible insert systems and = could provide advice, in particular with respect to:<br> - the flatness of the transfer function<br> - how much space the inserts take, whether they are made of hard material a= nd how much they stick out of the subject's ears<br> - any other desirable or undesirable features<br> <br> Thanks in advance<br> <br> Julien<span class=3D"HOEnZb"><font color=3D"#888888"><br> <br> -- <br> -------------------------------------<br> Julien Besle<br> Senior Investigator Scientist<br> MRC Institute of Hearing Research<br> University Park<br> Nottingham NG7 2RD<br> United Kingdom<br> <br> tel: +44 (0)115 951 8508 Ext 209<br> -------------------------------------<br> </font></span></blockquote></div><br><br clear=3D"all"><br>-- <br><div clas= s=3D"gmail_signature"><div dir=3D"ltr"><div><font color=3D"#6633ff" face=3D= "georgia,serif"><a href=3D"http://goog_636235333" target=3D"_blank">G Nike = Gnanateja, MSc (Audiology)</a></font></div><div><font color=3D"#6633ff" fac= e=3D"georgia,serif">Junior Research Fellow,</font></div><div><font color=3D= "#6633ff" face=3D"georgia,serif">Department of Audiology, </font></div><div= ><font color=3D"#6633ff" face=3D"georgia,serif">All India Institute of=C2= =A0Speech</font></div><div><font color=3D"#6633ff" face=3D"georgia,serif">a= nd Hearing Mysore-06</font></div></div></div> </div> --001a113d67727bfcc405228c4f07--