Disability Services Office (DSO) professionals at higher education institutions write alt text for {visual content}. However, due to the complexity of visual content, such as HCI figures in research publications, DSO professionals can struggle to write high-quality alt text if they lack subject expertise. Generative AI has shown potential in understanding figures and writing their descriptions, yet its support for DSO professionals is underexplored, and limited work evaluates the quality of alt text generated with AI assistance. In this work, we conducted two studies: first, we investigated generative AI support for writing alt text for HCI figures with 12 DSO professionals. Second, we recruited 11 HCI experts to evaluate the alt text written by DSO professionals. Findings show that alt text written solely by DSO professionals has lower quality than alt text written with AI assistance. AI assistance also helped DSO professionals write alt text more quickly and with greater confidence; however, they reported inefficiencies in interactions with the AI. Our work contributes to exploring AI support for non-subject expert accessibility professionals.

翻译：高等教育机构的残障服务办公室专业人员负责为视觉内容撰写替代文本。然而，由于视觉内容的复杂性（例如研究出版物中的人机交互图表），若缺乏相关学科专业知识，残障服务办公室专业人员可能难以撰写出高质量的替代文本。生成式AI在理解图表并生成描述方面已展现出潜力，但其对残障服务办公室专业人员的支持作用尚未得到充分探索，且目前少有研究评估AI辅助生成的替代文本质量。本研究开展了两项实验：首先，我们与12名残障服务办公室专业人员共同探究了生成式AI在为人机交互图表撰写替代文本方面的支持作用；其次，我们招募了11名人机交互领域专家对残障服务办公室专业人员撰写的替代文本进行评估。研究结果表明，完全由残障服务办公室专业人员撰写的替代文本质量低于AI辅助生成的文本。AI辅助还能帮助残障服务办公室专业人员更快速、更自信地撰写替代文本；然而，他们也报告了与AI交互过程中的效率问题。本研究为探索AI对非专业领域可访问性专业人员的支持作用提供了新的见解。