4-D NEUROIMAGING
EXHBIT 10.23
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<P ALIGN="RIGHT"><FONT SIZE=2><B>Exhibit&nbsp;10.23  </B></FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="kc1009_description_of_purchase_of_ser__des04383"> </A>
<A NAME="toc_kc1009_1"> </A></FONT> <FONT SIZE=2><B>Description of Purchase of Services of Dr.&nbsp;Galleon Graetz<BR>  September&nbsp;8, 1999    <BR>    <BR>    From    <BR>    <BR>    Carenet<BR>  Im Gruet<BR>  Meilen CH-8706<BR>  SWITZERLAND
<BR>  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Whereas, BTi would like to continue its current working relationship with Dr.&nbsp;Galleon Graetz and, </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Whereas,
the use of Dr.&nbsp;Graetz's time has become larger than is customary for he role of a member of the Board of Directors, </FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Therefore,
BTi would like to contract with MZR for Dr.&nbsp;Graetz's time over the next 6&nbsp;months as follows. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
areas of effort to be addressed by Dr.&nbsp;Graetz are as follows: </FONT></P>

<UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>1)</FONT></DT><DD><FONT SIZE=2>Coordination
and evaluation of investigation of the use of MSI in the evaluation of ADD, OCD and other disorders in cooperation with Dr.&nbsp;Clark in Las Vegas, and Mr.&nbsp;Steve
Cobb at BTi.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>2)</FONT></DT><DD><FONT SIZE=2>Coordination
of interface with Novartis to explore their interest in the use of MSI for new drug development.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>3)</FONT></DT><DD><FONT SIZE=2>Continued
coordination of efforts in the sale of an MSI system to Dr.&nbsp;Kr&auml;mer at the epilepsy clinic in Zurich.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>4)</FONT></DT><DD><FONT SIZE=2>Facilitate
Dr.&nbsp;Jeanmonod beginning his work with the BTi system in Konstanz.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>5)</FONT></DT><DD><FONT SIZE=2>Assist
BTi with the completion of the "Positive Symptoms' patent. </FONT></DD></DL>
</UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Dr.&nbsp;Graetz
will coordinate these efforts with Scott Buchanan, President&nbsp;&amp; CEO of BTi. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;It
is expected that this effort would not exceed 30&nbsp;hours/month. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;For
this effort BTi will reimburse MZR in the amount of $10,000/month payable at the beginning of each month. BTi will pay within 15&nbsp;days against an invoice from MZR. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;BTi
will reimburse all other expenses as incurred based on receipts turned into BTi. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This
effort is expected to have begun August&nbsp;1, 1999 and is expected to last through January&nbsp;31, 2000. This arrangement can be extended at any time by written mutual
consent of BTi and Dr.&nbsp;Graetz. </FONT></P>

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<P><FONT SIZE=2>Note:&nbsp;&nbsp;&nbsp;&nbsp;This
arrangement was executed under a purchase agreement and has been extended verbally on an ongoing basis. Billing and payment has been subject to negotiation of objectives met
and financial status of the Company. </FONT></P>

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<FONT SIZE=2><A HREF="#toc_kc1009_1">Description of Purchase of Services of Dr. Galleon Graetz September 8, 1999 From Carenet Im Gruet Meilen CH-8706 SWITZERLAND</A></FONT><BR>
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