The half-Fourier acquisition single-shot @entity9468 (HASTE) sequence allows for heavily T2-weighted images, and the inversion recovery (IR)-HASTE sequence represents the T1 value of the tissue in a very short time. This study was undertaken to determine whether characterizing focal @entity409 can be made by combination with these very fast sequences. Seventy-four @entity1 (33 @entity45 , 28 @entity2695 , and 33 malignant solid liver masses [15 metastatic @entity5 , 14 @entity157 , and 4 @entity201 ) underwent dynamic CT and breath-hold abdominal MRI using @entity9468 ( @entity9468 ), HASTE, and IR-HASTE sequences with variable T1 values on a 1.5-T MR unit. The imaging time for each slice was 2 seconds for HASTE imaging and 2 to 4 seconds for IR-HASTE imaging. Lesion detection and qualitative characterization were evaluated. Quantitative analysis was performed by measuring the contrast-to-noise ratios (CNRs) as well as visual analysis. The inversion time (TI) nulling values were also statistically analyzed. All @entity5409 were detected on both @entity9468 and HASTE imagings. For solid lesions, @entity9468 failed to detect one small solid lesion and HASTE sequence failed to detect three lesions. With HASTE sequences, all @entity45 and @entity2695 were markedly hyperintense in comparison with malignant solid masses. CNRs of @entity2695 or @entity45 were significantly higher than those of malignant solid masses (P < .01), and there was no overlap. The TI nulling value was 1,100+/-100 msec for @entity2695 , 1,900+/-110 msec for @entity45 , and 740+/-140 msec for malignant solid masses. There was no overlap between the TI nulling values of @entity2695 and @entity45 (P < .01). By combining the CNR from the HASTE sequence and the TI nulling value from the IR-HASTE sequence, complete discrimination among malignant solid masses, @entity2695 , and @entity96 could be made. Application of HASTE (representing T2 values) and IR-HASTE (representing T1 values) sequences provided a rapid and reliable imaging method for characterizing focal @entity409 without the use of contrast medium.

Characterization of focal @entity409 with half-fourier acquisition single-shot XXXX (HASTE) and inversion recovery (IR)-HASTE sequences.

@entity1 :: ('9606', 'Species') :: ['patients'] @entity5409 :: ('MESH:D052177', 'Disease') :: ['cystic lesions'] @entity2695 :: ('MESH:D006391', 'Disease') :: ['hemangiomas'] @entity5 :: ('MESH:D009369', 'Disease') :: ['tumors'] @entity96 :: ('MESH:D008113', 'Disease') :: ['cysts of the liver'] @entity409 :: ('MESH:D008107', 'Disease') :: ['liver lesions'] @entity201 :: ('MESH:D018281', 'Disease') :: ['cholangiocarcinomas'] @entity45 :: ('MESH:D010181', 'Disease') :: ['cysts'] @entity157 :: ('MESH:D006528', 'Disease') :: ['hepatocellular carcinomas'] @entity9468 :: ('MESH:D014717', 'Disease') :: ['turbo-spin-echo', 'TSE']
@entity9468 :: (MESH:D014717,Disease) :: ['turbo-spin-echo']
