What other imaging procedure, aside from lumbar spine series, is associated with delivering a high fetal dose above 10 mGy?

The correct choice is associated with abdomen fluoroscopy because this imaging procedure involves the use of real-time X-ray imaging, which can result in higher radiation doses compared to other imaging modalities. In particular, fluoroscopy continuously emits X-rays to create moving images, which means that the cumulative exposure can exceed 10 mGy, especially if the procedure is lengthy or if the area being examined is complex.

In contrast, CT abdomen studies do deliver significant doses of radiation, but the focus of the question is specifically on procedures that can continuously expose the fetus to radiation during the imaging process. Ultrasound of the abdomen does not use ionizing radiation, making it safe for fetal imaging, and MRI is a non-radiation-based imaging modality, using magnetic fields and radio waves instead. Therefore, abdomen fluoroscopy stands out as the correct choice due to its potential for delivering a significant radiation dose during the procedure.