instruction:
Given an abstract of a paper, generate a title for this paper such that conveys the key focus of the paper.
question:
Abstract: From December 1981 through August 1984, 24 patients with spinal cord compression syndrome due to epidural neoplasms were evaluated for radiotherapy with clinical examination, radiographs of the spine, and myelography. All plain films were reviewed, and mock radiotherapy fields designed using specific criteria for margins. The same patients were reviewed a second time considering the additional information provided by myelography. The initial treatment fields were found to be inadequate in 69% of the patients. Even in patients with discrete bony lesions, the results of myelography affected the treatment 45% of the time. A history of previous spinal irradiation significantly influenced port design in only 1 of the 7 patients who had received previous radiotherapy. Although invasive, myelography is essential in planning the treatment of spinal cord compression.
answer:
Impact of myelography on the radiotherapeutic management of malignant spinal cord compression.

question:
Abstract: Optical imaging of cortical activity offers several advantages over conventional electrophysiological and anatomical techniques. One can map a relatively large region, obtain successive maps to different stimuli in the same cortical area and follow variations in response over time. In the intact mammalian brain this imaging has been accomplished with the aid of voltage sensitive dyes. However, it has been known for many years that some intrinsic changes in the optical properties of the tissue are dependent on electrical or metabolic activity. Here we show that these changes can be used to study the functional architecture of cortex. Optical maps of whisker barrels in the rat and the orientation columns in the cat visual cortex, obtained by reflection measurements of the intrinsic signal, were confirmed with voltage sensitive dyes or by electrophysiological recordings. In addition, we describe an intrinsic signal originating from small arteries which can be used to investigate the communication between local neuronal activity and the microvasculature. One advantage of the method is that it is non-invasive and does not require dyes, a clear benefit for clinical applications.
answer:
Functional architecture of cortex revealed by optical imaging of intrinsic signals.

question:
Abstract: Vagal stimulation induced by sham feeding in 11 healthy subjects was used to examine the possibility that the autonomic nervous system might be involved in the control of human jejunal absorption. Gastric acid secretion was measured from gastric aspirates corrected for recovery, and jejunal absorption was determined using a triple lumen perfusion technique. Sham feeding induced a significant increase in gastric acid secretion from 1.29 to 7.73 mmol/h (p less than 0.02). Jejunal absorption of water decreased significantly from 41.0 to 26.8 ml/30cm/h (p less than 0.02), sodium from 2.60 to 0.74 mmol/30cm/h (p less than 0.05, and chloride from 2.68 to 0.74 mmol/30cm/h (p less than 0.02). During the hour after sham feeding gastric acid secretion and jejunal absorption returned towards basal values. These results suggest that vagal stimulation may have influenced jejunal absorption of salt and water in man and supports the possibility that the autonomic nervous system has a physiological role in the control of intestinal mucosal function.
answer:
Influence of sham feeding on salt and water absorption in the human jejunum.