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南京师范大学AHM:光声成像在脑疾病中的进展——原理、应用与临床转化挑战

  • 2026-04-16 02:16:06
南京师范大学AHM:光声成像在脑疾病中的进展——原理、应用与临床转化挑战
背景介绍
脑疾病(如胶质母细胞瘤、阿尔茨海默病、帕金森病、创伤性脑损伤、脑卒中等)是全球致残和致死的主要原因之一。2021年全球约34亿人患有神经系统疾病。然而,现有成像技术面临诸多局限:X射线CT和PET存在电离辐射风险;MRI与植入式医疗设备不兼容;荧光成像受光散射影响,空间分辨率和穿透深度有限。此外,血脑屏障(BBB)的存在使对比剂难以进入脑实质,脑组织的复杂血管结构和运动伪影也进一步增加了成像难度。因此,亟需一种非电离、高分辨率、深穿透且具备分子成像能力的新型脑成像技术。
研究思路
南京师范大学戴志晖教授、吴凡教授王兆寅教授联合团队系统总结了光声成像(PAI)在脑疾病成像中的基本原理、关键成像模式、对比剂类型及其应用进展。PAI结合了光学吸收对比与超声空间分辨率的优势,利用纳秒脉冲激光激发组织内源性或外源性生色团,产生热弹性膨胀并辐射超声信号,通过超声换能器检测并重建出光学吸收分布图。声波散射比光波低2-3个数量级,因此PAI可在毫米至厘米深度实现微米级分辨率。文章重点比较了四种主要成像模式:光学分辨率光声显微镜(OR-PAM,横向分辨率0.1-5 μm,深度0.5-1 mm)、声学分辨率光声显微镜(AR-PAM,5-100 μm,1-10 mm)、光声计算机断层扫描(PACT,10-350 μm,10-100 mm)以及光声内镜(PAE)。针对胶质母细胞瘤,PACT可全景显示深部肿瘤及血管生成,AR-PAM则精细刻画肿瘤微血管;针对神经退行性疾病,基于比率型分子探针的PACT实现了全脑Cu²⁺和NO的3D成像;针对创伤性脑损伤和中风,PAI可动态监测血管反应、血氧饱和度和干细胞归巢。文章还讨论了临床转化面临的五大挑战:BBB限制、运动伪影、对比剂审批、单模态局限及技术瓶颈,并提出了相应的解决策略。相关内容以Advances in Photoacoustic Imaging for Brain Diseases: Principles, Applications, and Clinical Translation Challenges发表在Advanced Healthcare Materials
图片解析
图1:总结了代表性光声诊断方法及其在脑疾病中的应用,并列出了临床转化的四大挑战(BBB、运动伪影、对比剂审批、单模态局限)。
图2:展示了PAI原理(光→热→超声)、主要对比剂类型(内源性:血红蛋白、黑色素、脂质;外源性:小分子染料、金属/半导体纳米结构、有机纳米结构),以及OR-PAM、AR-PAM、PACT在空间分辨率与穿透深度之间的权衡关系。
图3:比较了OR-PAM与AR-PAM的系统示意图。OR-PAM通过光学聚焦实现亚微米分辨率,用于淀粉样斑块和单细胞成像;AR-PAM通过声学聚焦结合深度学习,将横向分辨率从54.0 μm提升至5.1 μm。
图4:展示了PACT的代表性应用。圆形阵列PACT实现大鼠脑血流动力学成像;细菌光色素BphP1标记的U87肿瘤在深约3 mm处被清晰显示;人体PACT系统(10 cm视野,350 μm分辨率)可检测手指敲击诱发的功能激活。
图5:展示了外源性对比剂在胶质母细胞瘤PAI中的应用。2D硅量子片、功能化金纳米片和有机组装体LET-12均可跨越BBB,实现原位胶质瘤的PAI引导光热治疗,成像深度达2-3 mm。
图6:展示了用于神经退行性疾病中Cu²⁺和NO成像的比率型PA探针。ZnSe纳米片和PAcu3探针实现了AD/PD小鼠脑中Cu²⁺的3D分布成像(深度8 mm,分辨率126 μm);PAno2探针结合PACT在8 mm深度可视化PD模型脑内NO动态。
图7:展示了PAI在创伤性脑损伤和中风中的应用。AMEC纳米复合物靶向TBI病灶并实现MRI/PAI双模态成像;微胶质细胞仿生纳米平台MiCM-NPs用于血栓超声/光声双模成像与溶栓。
图8:展示了脑血管成像。可代谢半导体聚合物纳米颗粒SPN-PT在1064 nm激发下实现全脑血管高对比度PACT成像;PTD NPs在NIR-II区实现深度1 mm、分辨率25.4 μm的3D脑血管成像。
图9:展示了BBB穿越策略与多模态成像。酶响应金纳米棒探针通过鞘内注射绕过BBB;ICG与Fe³⁺配位形成J聚集体,用于铁过载疾病的MRI/PAI双模成像;超声/光声/荧光三模态成像指导前哨淋巴结活检。
结论
光声成像凭借其非电离、高分辨率、深穿透和多尺度成像能力,已成为脑疾病诊断的有力工具。通过合理选择成像模式(OR-PAM/AR-PAM/PACT/PAE)与对比剂(内源性或外源性),PAI已成功应用于胶质母细胞瘤、神经退行性疾病、创伤性脑损伤、中风和脑血管疾病的结构、功能与分子成像。尽管BBB限制、运动伪影、对比剂临床审批、单模态局限及技术瓶颈仍是临床转化的主要障碍,但通过高速成像、深度学习重建、多模态融合及新型BBB穿越策略,PAI有望在未来成为脑疾病精准诊疗的重要平台。

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原文链接:
https://doi.org/10.1002/adhm.202505743
来源:BioMed科技声明:仅代表作者个人观点,作者水平有限,如有不科学之处,请在下方留言指正!

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  1. CONNECT:[ UseTime:0.000760s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000866s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000319s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000258s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000510s ]
  6. SELECT * FROM `set` [ RunTime:0.000237s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000557s ]
  8. SELECT * FROM `article` WHERE `id` = 533527 LIMIT 1 [ RunTime:0.000441s ]
  9. UPDATE `article` SET `lasttime` = 1776816573 WHERE `id` = 533527 [ RunTime:0.001642s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000234s ]
  11. SELECT * FROM `article` WHERE `id` < 533527 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000437s ]
  12. SELECT * FROM `article` WHERE `id` > 533527 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001733s ]
  13. SELECT * FROM `article` WHERE `id` < 533527 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000665s ]
  14. SELECT * FROM `article` WHERE `id` < 533527 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000782s ]
  15. SELECT * FROM `article` WHERE `id` < 533527 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003196s ]
0.084998s