National Personal Protective Technology Laboratory/National Institute for Occupational Safety and Health/Centers for Disease Control and Prevention, Pittsburgh, Pennsylvania.
Am J Ind Med. 2011 Aug;54(8):628-36. doi: 10.1002/ajim.20970. Epub 2011 May 18.
This study was undertaken to determine the utility of an infrared camera (IRC) for assessing leaks around filtering facepiece respirators (FFR) during quantitative respirator fit testing.
Eight subjects underwent quantitative fit testing on six N95 FFR models (48 total fit tests) while simultaneously being recorded with an IRC.
The IRC detected 49 exhalation leaks during 39 tests and no leaks in nine tests. Exhalation leaks were identified in all failed fit tests (13) and a majority (26 of 35) of passed tests. Anatomically, the nasal region and malar (cheekbone) regions accounted for 71% of identified leak sites. Fit factors for fit tests without identified exhalation leaks were significantly higher than fit tests with leaks detected by IRC (P = 0.01).
Thermal imaging using IRC can detect leaks in respiratory protective equipment and has the potential as a screening tool for assessment of the adequacy of post-donning FFR fit.
本研究旨在确定红外摄像机（IRC）在定量呼吸器 fit 测试期间评估过滤式面罩呼吸器（FFR）周围泄漏的实用性。
8 名受试者在六种 N95 FFR 模型上进行定量 fit 测试（共 48 次 fit 测试），同时使用 IRC 进行记录。
IRC 在 39 次测试中检测到 49 次呼气泄漏，在 9 次测试中未检测到泄漏。所有失败的 fit 测试（13 次）和大多数（35 次中的 26 次）通过的测试都发现了呼气泄漏。解剖学上，鼻区和颧骨（脸颊骨）区域占确定泄漏部位的 71%。未发现呼气泄漏的 fit 测试的 fit 因子明显高于 IRC 检测到泄漏的 fit 测试（P=0.01）。
IRC 进行的热成像可以检测呼吸防护设备中的泄漏，并且有潜力作为评估 FFR 佩戴后 fit 情况的筛查工具。
