Abstract
Purpose
Somatostatin receptor scintigraphy with [111In]-diethylene triamine pentaacetate acid (DTPA)-octreotide is an accurate method for detecting neuroendocrine tumours (NETs) but often does not provide clear anatomical localisation of lesions. The aim of this study was to assess the clinical usefulness of anatomical-functional image fusion.
Materials and methods
Fifty-four patients with known or suspected NET were included in the study. Planar and single-photon-emission computed tomography (SPECT) imaging was performed using a dual-head gamma camera equipped with an integrated X-ray transmission system, and the images were first interpreted alone by two nuclear medicine physicians and then compared with SPECT/CT fusion images together with a radiologist. The improvement provided by SPECT/CT in the interpretation of SPECT data alone and any modification in patientmanagement were recorded.
Results
Fusion images improved SPECT interpretation in 23 cases, providing precise anatomical localisation of increased tracer uptake in 20 cases and disease exclusion in sites of physiological uptake in 5. In 10 patients, SPECT/CT allowed definition of the functional significance of lesions detected by diagnostic CT. SPECT/CT data modified clinical management in 14 cases by changing the diagnostic approach in 8 and the therapeutic modality in 6.
Conclusions
Our study demonstrates that image fusion is clearly superior to SPECT alone, allowing precise localisation of lesions and reducing false-positive results.
Riassunto
Obiettivo
La scintigrafia con 111In-DTPA-octreotide rappresenta un metodo accurato per la diagnosi dei tumori neuroendocrini, ma spesso non fornisce una corretta localizzazione anatomica delle lesioni. Scopo di questo studio è valutare l’utilità clinica della fusione di immagini SPECT-TC.
Materiali e metodi
Sono stati inclusi 54 pazienti con tumore neuroendocrino sospetto o noto. Le immagini planari e SPECT, ottenute utilizzando una gamma-camera a doppia testata con integrato sistema trasmissivo TC, sono state interpretate prima separatamente da due medici nucleari e poi confrontate con immagini di fusione insieme ad un radiologo, per valutare i miglioramenti apportati dalla fusione nell’interpretazione delle immagini SPECT e nella gestione del paziente.
Risultati
Le immagini di fusione hanno migliorato l’interpretazione SPECT in 23 casi, permettendo una precisa localizzazione anatomica dei siti patologici in 20 casi e l’esclusione di malattia in siti di accumulo fisiologico in 5. In 10 pazienti SPECT/TC ha permesso la definizione funzionale di lesioni evidenziate alla TC diagnostica. SPECT/TC ha modificato il management clinico in 14 pazienti, modificando l’approccio diagnostico in 8 e quello terapeutico in 6.
Conclusioni
Il nostro studio dimostra che la fusione di immagini è chiaramente superiore alla sola SPECT, permettendo una precisa localizzazione delle lesioni individuate e riducendo i risultati falsi positivi.
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Castaldi, P., Rufini, V., Treglia, G. et al. Impact of 111In-DTPA-octreotide SPECT/CT fusion images in the management of neuroendocrine tumours. Radiol med 113, 1056–1067 (2008). https://doi.org/10.1007/s11547-008-0319-9
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DOI: https://doi.org/10.1007/s11547-008-0319-9