Update Hardware/readme.md

Hardware/readme.md

@@ -57,6 +57,8 @@ We need to drill two holes to the lids. The hole at front lid will be used for t
 
 ### Lead Trajectories
 
+Six different realistic deep brain stimulation (DBS) [lead trajectories][2a] extracted from patient CT data were constructed for the RF safety testing. We printed the models using a 3D printer. Then, we used semi-rigid coaxial wire and shaped them around the printed models.   
+
 ### ASTM Holders
 
 ### Bill of Materials
@@ -102,8 +104,9 @@ We need to drill two holes to the lids. The hole at front lid will be used for t
 |2.2      | Heat-shrink tube                         | Not specified                                 | -                      | -        | -               |
 |2.3      | [PLA, 3D printing                  ][bc] | [Ultimaker, Ultimaker tough PLA        ][52]  | 47.00                  | 1        | 47.00           |
 |2.4      | [PVA, 3D printing (sup. material)  ][bd] | [Ultimaker, Ultimaker natural PVA      ][53]  | 105.00                 | 1        | 105.00          |
-|2.5      | [Extension cable                   ][be] | [Amphenol RF, 135101-01-24-00          ][54]  | 26.00                  | 1        | 26.00           |
+|2.5      | [Extension cable                   ][be] | [Amphenol RF, 135101-01-24-00      ][54][^4]  | 26.00                  | 1        | 26.00           |
 
+[^4]: The extension cable will be replaced in the next version because it has magnetic components disturbing the MR images 
 
 [//]: <> (References for the figures)
 
@@ -170,3 +173,4 @@ We need to drill two holes to the lids. The hole at front lid will be used for t
 
 [1a]: https://software-dl.ti.com/lprf/simplelink_cc26x2_latest/docs/ble5stack/ble_user_guide/html/ble-stack-oad/index.html "See documentation"
 [1b]: https://e2e.ti.com/support/wireless-connectivity/zigbee-thread-group/zigbee-and-thread/f/zigbee-thread-forum/843250/cc2652r-cc2652-internal-dc-dc-converter-vs-global-ldo "See discussion"
+[2a]: https://iopscience.iop.org/article/10.1088/1361-6560/aabd50 "Open the article"