title: Value of apparent diffusion coefficient calculation before and after gustatory stimulation in the diagnosis of acute or chronic parotitis.
abstract: The purpose of the study was to investigate the value of diffusion-weighted (DW) echo-planar imaging (EPI) for quantifying physiological changes of the parotid gland before and after gustatory stimulation in patients suffering from acute or chronic recurrent inflammation in comparison with healthy volunteers. Using a DW-EPI sequence at 1.5 T, parotid glands of 19 consecutive patients with acute (n=14) and chronic (n=5) inflammation of parotid glands and 52 healthy volunteers were examined. Magnetic-resonance (MR) images were obtained before and after gustatory stimulation with 5 cc of lemon juice. In volunteers mean ADC values of 1.14 x 10(-3) mm(2)/s before and 1.2 x 10(-3) mm(2)/s after gustatory stimulation were observed. In acute inflammation ADC values were higher before [1.22 x 10(-3) mm(2)/s (p=0.006)] and after stimulation [1.32 x 10(-3) mm(2)/s (p<0.001)]. Before stimulation ADC differences between chronic inflammation (1.05 x 10(-3) mm(2)/s) and healthy volunteers (p=0.04) as well as between acute and chronic inflammation (p=0.005) were statistically significant. No differences were detected after stimulation between chronic inflammation (1.2 x 10(-3) mm(2)/s) and healthy volunteers (p=0.94) and between acute and chronic inflammation (p=0.15), respectively. DW-EPI seems to display the physiological changes of the parotid gland in patients suffering from acute or chronic inflammation and might be useful for discriminating healthy from affected glands.
authors.affiliation: Department of Diagnostic and Interventional Radiology, Diagnostic Center, Hamburg, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Ries
authors.forename: C
authors.initials: C
authors.lastname: Arndt
authors.forename: M
authors.initials: M
authors.lastname: Regier
authors.forename: J
authors.initials: J
authors.lastname: Graessner
authors.forename: M C
authors.initials: MC
authors.lastname: Cramer
authors.forename: F
authors.initials: F
authors.lastname: Reitmeier
authors.forename: M
authors.initials: M
authors.lastname: Jaehne
authors.forename: G
authors.initials: G
authors.lastname: Adam
authors.forename: C R
authors.initials: CR
authors.lastname: Habermann
mesh_terms: D000208:Acute Disease; D000293:Adolescent; D000328:Adult; D000368:Aged; D000465:Algorithms; D001628:Beverages; D002648:Child; D002908:Chronic Disease; D002957:Citrus / Q000737:chemistry*; D038524:Diffusion Magnetic Resonance Imaging / Q000379:methods*; D005260:Female; D006801:Humans; D007089:Image Enhancement / Q000379:methods; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008297:Male; D008875:Middle Aged; D010306:Parotid Gland / Q000187:drug effects*; D010309:Parotitis / Q000175:diagnosis* / Q000503:physiopathology; D010936:Plant Extracts / Q000008:administration & dosage; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013649:Taste / Q000187:drug effects*; D055815:Young Adult
chemical_list: D010936:Plant Extracts