Initial experience of 3 Tesla versus conventional field strength magnetic resonance imaging of small functioning pituitary tumours

Stobo, D.B., Lindsay, R.S. , Connell, J.M. and Dunn, L. (2011) Initial experience of 3 Tesla versus conventional field strength magnetic resonance imaging of small functioning pituitary tumours. Clinical Endocrinology, 75(5), pp. 673-677. (doi: 10.1111/j.1365-2265.2011.04098.x)

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Higher field strength magnetic resonance imaging (MRI) is becoming increasingly available and offers improved image quality; however, the clinical usefulness of this technique for the demonstration of surgically treatable functional pituitary adenomas has not been clearly established. Objective To determine whether 3 Tesla (3T) MRI improves the detection of ACTH-and GH-secreting microadenomas over conventional imaging at field strengths of up to 1.5 Tesla (1.5T). Design Data sets from postgadolinium T1-weighted MRI at 1.5T and 3T were blinded, randomly ordered and assessed for the presence of pituitary tumour by two radiologists. Where possible, lesion signal difference to noise ratio (SDNR) was calculated for quantitative comparison. Imaging diagnoses were correlated with subsequent surgical and histological findings. Patients Twenty-four patients (10 men, 14 women) with biochemical evidence of Cushing's disease (19) or acromegaly (5) were identified over a 5-year period. Results 1.5T MRI gave a clear diagnosis of 12 pituitary tumours, all confirmed at 3T. Four additional definite lesions and one suspicious case were correctly identified at 3T. Histological correlation in 21 cases showed sensitivity improving from 54% with 1.5T to 85% with 3T. Radiologists' subjective image preference favoured 3T in 92%. Quantitative difference between tumour and parenchymal signal was significantly greater at 3T (mean SDNR -7.9 [3T] and -2.8 [1.5T], paired t-test P < 0.05). Conclusions 3T MRI appears to offer increased conspicuity and detection of GH- and ACTH-secreting pituitary microadenomas. It is potentially clinically useful when 1.5T imaging is negative or equivocal.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Connell, Professor John and Dunn, Mr Laurence and Lindsay, Dr Robert
Authors: Stobo, D.B., Lindsay, R.S., Connell, J.M., and Dunn, L.
College/School:College of Medical Veterinary and Life Sciences > Institute of Cardiovascular and Medical Sciences
College of Medical Veterinary and Life Sciences > School of Life Sciences
Journal Name:Clinical Endocrinology
Publisher:Blackwell Publishing

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