posterio-anterior tomogram of maxillae

例句：

1. 1. The doctor ordered a posterior-anterior X-ray of the patient's spine to check for any fractures.
   医生为患者拍了后前位X光片，以检查是否有骨折。
2. 2.After the surgery, the patient was taken for a posterior-anterior X-ray to monitor the healing process.
   手术后，患者被安排进行后前位X光片检查，以监测愈合过程。
3. 3.The anatomy class conducted a posterior-anterior X-ray to demonstrate the relationship between the vertebrae and their surrounding structures.
   解剖学课上进行了一次后前位X光片展示，以显示椎骨及其周围结构之间的关系。