可以與DRT4搭配
    專為深部組織、骨骼（股骨頭）的血流量監(jiān)測而設(shè)計
    功率為20mW 785NM 
    典型應(yīng)用：
    術(shù)中骨膜血流灌注量監(jiān)測（如股骨頭）
    經(jīng)皮肌肉組織血流灌注量監(jiān)測
    The IRLD20? infra-red laser diode light source is a separate mains powered accessory for the DRT4? which allows measurements to be made using a higher power laser than that used in the standard DRT4?.
    The IRLD20? allows measurements to be taken specifically from deeper tissues where measurements are impractical using the lower power of the standard DRT4? and the narrower fibre separation of standard probes. The typical output power from the IRLD20? probe tip is approximately 20 mW at 785nm.
    Typical applications include measurements from bone at surgery (e.g. assessment of flow in the femoral head), or non invasive measurements of muscle flow through lean skin.