Double-phase (131)I whole body scan and (131)I SPECT-CT images in patients with differentiated thyroid cancer: their effectiveness for accurate identification.

Abstract:

OBJECTIVE:This study aims to determine whether a (131)I double-phase whole body scan (WBS) and SPECT-CT images have added value over a single-phase WBS image in identifying benign and malignant lesions in patients with well-differentiated thyroid cancer (DTC) at their first radioactive iodine (RAI) treatment. METHODS:This study included 42 DTC patients who underwent their first radioablation. Post-therapeutic WBS images were acquired after 3 days (early phase) and 7 days (delayed phase). Following early-phase WBS, SPECT-CT images were obtained. The images were reviewed independently of the clinical data by 2 board-certified observers with a 6-point scoring system (benign to malignant -3 to +3). RESULTS:The double-phase WBS and SPECT-CT images showed 115 radioiodine-avid localizations (81 benign and 34 malignant accumulations). Confidence levels of benign accumulations were significantly higher with SPECT-CT (average score -2.40 ± 1.06) compared to those of the early-phase WBS (average score -1.39 ± 1.88) (p < 0.0001) and delayed-phase WBS images (average score -1.49 ± 1.19) (p < 0.0001). When the analysis was restricted to accumulations with a low confidence score in the early-phase WBS image, the confidence level of the delayed-phase WBS was higher compared to that of the early-phase WBS images (p = 0.0012). The confidence levels of malignant accumulations were significantly higher with SPECT-CT images (average score 2.37 ± 0.96) compared to the early-phase WBS (average score 1.44 ± 1.21) (p < 0.0001) and the delayed-phase WBS images (average score 1.50 ± 1.13) (p < 0.0001). CONCLUSION:Post-therapeutic SPECT-CT image was superior to the early-phase WBS image in enhancing the confidence level and accurately localizing the lesions. The delayed-phase WBS image contributed to the accurate diagnosis of benign lesions with a low confidence level in the early-phase WBS image.

journal_name

Ann Nucl Med

authors

Wakabayashi H,Nakajima K,Fukuoka M,Inaki A,Nakamura A,Kayano D,Kinuya S

doi

10.1007/s12149-011-0513-z

subject

Has Abstract

pub_date

2011-11-01 00:00:00

pages

609-15

issue

9

eissn

0914-7187

issn

1864-6433

journal_volume

25

pub_type

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