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Image Analysis 189 7.5 USER SOLUTION: AUTOMATED INSTRUMENTATION FOR THE ASSESSMENT OF PERIPHERAL VASCULAR FUNCTION Anne M. BrumÞeld and Aaron W. Schopper National Institute of Occupational Safety and Health 1095 Willowdale Road Morgantown, WV 26505-2888 Tel 304-285-6312/Fax 304-285-6265 Email: Znr1@cdc.gov Methods for quantifying the injurious effects of vibration are a major focus for those evaluating hand arm vibration syndrome (HAVS) in the workplace. The physiologic changes in the microcirculation that occur following vibration exposure are not well understood; therefore, methods for evaluating blood ßow in exposed worker populations are of particular interest. FIGURE 7.35 Initial user interface. A nail press test (Figure 7.35) has been used by clinicians to assess peripheral circulatory function. Following a 10-second press of the Þngernail, a visual determination of the rate of blood ßow return is made, as evidenced by the return of color to the Þngernail. Of a qualitative and subjective nature, the test has been deemed most meaningful when used as one among several in a battery of health effect assessment tests. 1,2 New instrumentation representing an automated version of the nail press has 1 Olsen, N. (2002). Diagnostic aspects of vibration-induced white Þnger. Int. Arch. Occup. Environ. Health, 75: 6–13. 2 Harada, N. (1987). Esthesiometry, nail compression and other function tests used in Japan for evaluating the hand–arm vibration syndrome. Scand. J. Work Environ. Health, 13: 330–333.
190 Image Acquisition Processing with LabVIEW been built utilizing a CMOS camera, and force and photoplethysmograph transducers. A LabVIEW interface, enabling simultaneous image and data acquisition, provides a basis for the standardization of the force application and duration. The raw data is postprocessed and analyzed automatically, thereby eliminating observer subjectivity, and providing quantitative results with which worker populations can be evaluated. FIGURE 7.36 Image press prototype (rear view). 7.5.1 THE HARDWARE The following components were incorporated into the system design (Figure 7.36): • National Instruments AI-16XE-50 DAQ Card • National Instruments PCI-1411 • National Instruments SC-2043-SG, strain gauge accessory • Miniature CMOS Camera (1/3 inch format, 510 × 492 array size) • Load cell • Photoplethysmograph transducer, power supply, amplifier (Biopac) 7.5.2 THE SOFTWARE 7.5.2.1 DAQ An interactive front panel (Figure 7.35) provides access to a variety of VIs within a waiting state machine. Relevant subject data is entered by the operator, including ID number, finger and room temperature, handedness and finger designation, which are incorporated into the appropriate file header or directory designation.
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IMAGE PROCESSING SERIES Series Edit
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Foreword The introduction of LabVIE
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FIGURE 1 Vision 6.1 FIGURE 2 Compan
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Acknowledgments My gratitude goes o
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Dedication To Don “old fella” P
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Contents Chapter 1 Image Types and
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Chapter 4 Displaying Images........
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Chapter 7 Image Analysis...........
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1 Image Types and File Management F
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Image Types and File Management 3 F
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Image Types and File Management 5 A
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Image Types and File Management 7 C
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Image Types and File Management 9 p
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Image Types and File Management 11
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Image Types and File Management 13
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2 Setting Up You should never under
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Setting Up 17 FIGURE 2.3 (a) Interl
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Setting Up 19 Linear Aray Light Sou
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Setting Up 21 FIGURE 2.7 National I
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Setting Up 23 2.1.3.2 Control and I
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Setting Up 25 FIGURE 2.11 X-Ray ima
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Setting Up 27 Apple Computer techno
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Setting Up 29 FIGURE 2.17 An inexpe
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Setting Up 31 Although this would b
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Setting Up 33 134 -115 \ Contrast =
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Setting Up 35 resolution printer wi
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Setting Up 37 C A B C Traditional T
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Setting Up 39 Camera Light Source O
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Setting Up 41 Camera Light Source (
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Setting Up 43 FIGURE 2.37 (a) An ob
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Setting Up 45 FIGURE 2.41 (a) PCB p
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100 Image Acquisition Processing wi
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Page 174 and 175: Morphology 151 FIGURE 6.12 Fill hol
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Page 180 and 181: Morphology 157 6.5 CASE STUDY: FIND
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Page 254 and 255: Glossary 231 binary display device
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