Publications by authors named "William J Chapman"
Article Synopsis
- Few studies have looked into how accurate and consistent firearms examiners are when comparing bullets, especially when they're damaged or from different types of ammunition.
- This research involved 49 forensic firearms examiners making over 3,000 bullet comparisons, focusing on two main scenarios: comparing bullets of unknown origins and bullets from different known firearms.
- Key findings showed that bullet quality significantly affects decision rates, with more inconclusive results from certain bullet types and discrepancies in decision rates among different firearm models and examiner participants.
Tire impression evidence can be a valuable tool during a crime scene investigation-it can link vehicles to scenes or secondary locations, and reveal information about the series of events surrounding a crime. The interpretation of tire impression evidence relies on the expertise of forensic tire examiners. To date, there have not been any studies published that empirically evaluate the accuracy and reproducibility of decisions made by tire impression examiners.
View Article and Find Full Text PDFWe have developed a novel photoacoustic microscopy/ultrasound (PAM/US) endoscope to image post-treatment rectal cancer for surgical management of residual tumor after radiation and chemotherapy. Paired with a deep-learning convolutional neural network (CNN), the PAM images accurately differentiated pathological complete responders (pCR) from incomplete responders. However, the role of CNNs compared with traditional histogram-feature based classifiers needs further exploration.
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