CT scanning of colonic cancer showed 75% accuracy in identifying T1 and T2 cancers combined, but gave poor agreement between CT and histopathology for individual T stages.

Cerebral infarction will cause ischemic encephalopathy and lactate accumulation in the brain in acute cerebral infarction. This study investigated the optimization of pulse sequences for lactate detection and its diagnostic value in acute cerebral infarction using proton MR spectroscopy ((1)H MRS). The studies were performed on a phantom and on 17 patients with acute cerebral infarction. Examinations were performed with a GE 1.5T MRI system (Signa). The spectra were obtained using both PRESS and STEAM sequences. The spectra were processed using a GE Advantage workstation (ADW 4.3). Moreover, the optimal sequence combined with other sequences, including conventional MRI sequences and MR DWI, were used to acquire proton MRI data for 17 patients with acute cerebral infarction and 20 healthy volunteers. The maximum lactate peaks using TE=135 ms were down doublet whereas the peaks using 270 ms were up doublet. Lactate peaks were ascending in 17 patients with cerebral infarction. Optimized (1)H MRS sequences are useful for better detection of lactate in acute cerebral infarction.

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