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In this study, we conducted an experiment aimed at developing an effective method for measuring the useful field of view when driving while maintaining free visual (eye and head free) conditions with completely unobstructed head and eye movements. In the experiment, the mental workload was changed in a stepwise manner in order to test the hypothesis that the useful field of view becomes narrower as the mental workload (MWL) increases, as well as to verify the accuracy of the proposed method. The results confirmed the validity and accuracy of the proposed method for measuring the useful field of view under completely unobstructed visual conditions.

An 81-year-old man was referred to our hospital for hepatic dysfunction that was identified in an outpatient visit to another hospital. Abdominal contrast-enhanced CT revealed a tumor extending from the hepatic portal region to the left hepatic duct. Thus, the patient was diagnosed with hilar cholangiocarcinoma. Before surgery, EBD tube placement was performed because of obstructive jaundice. Subsequently, pancreatitis developed. CT revealed an inflammatory thrombus from the main trunk to the right branch of the portal vein. Thrombolytic therapy through the superior mesenteric artery was ineffective, with concurrent postoperative bleeding from the papilla. Four days after thrombus formation, catheterization was performed via the ileocolic vein under laparotomy for intraportal thrombus aspiration. Thirty days after the start of thrombosis treatment, left hepatectomy and bile duct resection were performed because portal vein blood flow resumed. The patient was diagnosed with carcinosarcoma. He has survived without recurrence for three years after surgery. We herein report this case of portal thrombosis in the remnant liver, for which radical surgery was performed postoperatively.

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