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Microsoft PowerPoint 2003</li> <li>资料大小: 31.5 KB</li> <li>下载次数: 32</li> <li>上传会员: <a href="attachcenter-list.html?uid=35332" target="_blank" style="color:#FF9900">kaigegaochang</a></li> <li>上传时间: 2005-09-24</li> <li>本站网址: <a href="http://forum.oecr.com/">forum.oecr.com</a></li> <li><a href="http://bbs.oecr.com/thread-38948-1-1.html" target="_blank">查看资料所在的主题</a></li> <li><a href="http://bbs.oecr.com/forum.php?mod=attachment&aid=NzI1OXw2NzNmYzhkZHwxNzY1OTU5ODgyfDB8MA%3D%3D" target="_blank" style="color:#FF9900">下载资料 </a></li> </ul> </div> <DIV style="CLEAR: both"></DIV> <b>欢迎下载本站资料，下载前请先登录您的社区账号。</b></div> </div> <DIV style="CLEAR: both"></DIV> <div class="bm cl" style="padding:5px;"> <p><button type="submit" class="pn vm" onclick="setCopy('http://forum.oecr.com/plugin.php?id=attachcenter:page&aid=7259', '链接已经复制到剪贴板');" type="submit"> <em>复制链接推荐给好友</em></button> <input type="text" class="px vm" onclick="this.select();setCopy(this.value, '链接已经复制到剪贴板');" value="http://forum.oecr.com/plugin.php?id=attachcenter:page&aid=7259" size="50" /></p> </div> <div class="bm"> <div class="bm_c xld"> <b>生物光子学几个常见错误观点:</b><div class="postmsg"> <br /> </div> <div class="postmsg">你好，很高兴能与你讨论。<br /> 你列出的第一问题，我觉得应该是红外比红光穿透深度深，而且我觉得是波长越长，穿透越深，不知道你说的窗口在哪里？<br /> 第二个我没什么意见。<br /> 第三个，我记得好像是相反的，恰好是连续光要深一些。因为脉冲光一般做多光子激发。<br /> 同样的平均功率下，单光子激发更容易，产生的荧光信号更强，这样成像深度更深，因此好像是连续光看的更深一些阿。</div> <div class="postmsg">Hi muddyren,<br /> 我附了张图请参照.人体组织对700纳米以下的光吸收较大,主要是血红蛋白等,而在900纳米以上,水的吸收很严重,这就是为什么我说700-900纳米是光最易穿透组织的一个窗口.跟据我的经验,在这个波长范围内,人体组织对光的衰减大致是1 OD/厘米,即每厘米厚度衰减至初值的1/10.<br /> 至于脉冲光,如果我们不考虑双光子激发的话,就可将其看作缩短的连续光,而脉冲光的峰值通常较高,以保证同样的平均功率,因此,穿透深度自然就大了.</div> <div class="postmsg">关注中........................<br /> <img src="static/image/smiley/default/em05.gif" smilieid="34" border="0" alt="" /></div> <div class="postmsg">本想用另一个图，可是大于100KB, 传不上去</div> <div class="postmsg">你好啊，这几天不在。现在才来。<br /> 我看了你给的图片，我觉得我们是从问题的不同角度看这个事情了。你讲的是吸收，我讲的是散射。光在组织中传播时，存在吸收和散射，而一般来讲是散射大于吸收的（我记得好像是），而散射的大小跟波长的4次方成反比，波长越大散射越小，相对你说的吸收窗口，我觉得是散射影响更大，因此我说波长越长，看得越深。<br /> 关于连续光和脉冲光，你说得对，如果不考虑双光子激发，那确实是脉冲光深一些，就象很多地方搞激光测距得时候，用得都是脉冲光，因为传得远啊。不过要看是多少得脉冲宽度，如果达到了ps级别，那肯定要考虑双光子效应了。<br /> 很高兴与你讨论。</div> <div class="postmsg"><<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />>~{G0<8LlR;V1=x2;@4~}. ~{2;4m~}, ~{2(3$T=3$~}, ~{I"IdT=P!~}. ~{5+JG~}, ~{SISZIzNoWiV/6T9b5DN|JUKfWE2(3$5DTv<S6xOTVxTv4s~}, ~{<4N|JU3IN*Vw5<RrKX~}, ~{Rr4K~}, ~{TZ4sSZ~}900-1000~{DICW:s~}, ~{9bTZWiV/VP5D4)M8In6HJG<uP!6x2;JGTv<SAK~}. ~{NRH%URR;OB~}, ~{?4D\2;D\UR5=R;UE4)M8In6HKf2(3$5D1d;/M<~}, ~{IT:sLy5=Ub@o~}.</P></div> <div class="postmsg"><img src="data/attachment/forum/dvbbs/2005-10/200510117324776688.jpg" onload="javascript:if(this.width>600)this.width=600;"><br /> <img src="data/attachment/forum/dvbbs/2005-10/200510117331126572.jpg" onload="javascript:if(this.width>600)this.width=600;"></div> <div class="postmsg">第二个图很有说服力啊。看来确实是有一个转折点</div> <div class="postmsg"><<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />>值得一看的好贴，不要沉下去哦～</P></div> <div class="postmsg">曾经有过这么好的帖子，可惜当时没看到……<br /> 我用OCT在830nm和1300nm两个波段的近红外光探测皮肤，实际得到的还是1300nm的信号深度更深，好像和第二个图的结论有出入，不知道有没有人能知道其中的原由呢？<br /> <br /> OCT测量的是背向单次或者几次散射回来的光子信号。</div> <div class="postmsg"><div class="quote"><blockquote>曾经有过这么好的帖子，可惜当时没看到……<br /> 我用OCT在830nm和1300nm两个波段的近红外光探测皮肤，实际得到的还是1300nm的信号深度更深，好像和第二个图的结论有出入，不知道有没有人能知道其中的原由呢？<br /> <br /> OCT测量 ...<br /> <font size="2"><font color="#999999">dxs 发表于 2009-7-11 23:54</font> <a href="http://bbs.oecr.com/redirect.php?goto=findpost&pid=572197&ptid=38948" target="_blank"><img id="aimg_L8dVh" onclick="zoom(this, this.src, 0, 0, 0)" class="zoom" src="static/image/common/back.gif" onmouseover="img_onmouseoverfunc(this)" onload="thumbImg(this)" border="0" alt="" /></a></font></blockquote></div><br /> 从图中看，1300处水吸收比较强，而830这三种物质的吸收都比较低。我没研究过OCT，我们做多光子成像，主要用700-850。是不是与散射有关，与吸收关系不是很直接</div> <div class="postmsg">好东西呀.<br /> 听说,北京301医院用长春新产业的激光器做"光动力治疗血管瘤"很有效.<br /> 这种激光穿透性要求的指标是什么?</div> <div class="postmsg">好贴呀...............................</div> <div style="height200px;"></div> <ul class="xl xl2 cl" style="border-top: 1px #cccccc dashed;margin:5px 0 ;padding-top:5px"> <dl><b> 同一主题资料:</b></dl><dl class='icon'><img src="static/image/filetype/msoffice.gif" border="0" class="vm" alt="" /> <a href="attachcenter-page.html?aid=7229" title="FHp8z11I.doc">FHp8z11I.doc</a> <font color="#AAAAAA">(19 KB)</font> </dl> <dl class='icon'><img src="static/image/filetype/msoffice.gif" border="0" class="vm" alt="" /> <a href="attachcenter-page.html?aid=7258" title="4MnzmRUL.ppt">4MnzmRUL.ppt</a> <font color="#AAAAAA">(31.5 KB)</font> </dl> <dl class='icon'><img src="static/image/filetype/msoffice.gif" border="0" class="vm" alt="" /> <a href="attachcenter-page.html?aid=7259" 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