Format

Send to

Choose Destination
Indian J Nucl Med. 2020 Jan-Mar;35(1):13-16. doi: 10.4103/ijnm.IJNM_119_19. Epub 2019 Dec 31.

Does Intravenous Contrast Improve the Diagnostic Yield of Fluorodeoxyglucose Positron-emission Tomography/Computed Tomography in Patients with Head-and-neck Malignancy.

Author information

1
Department of Nuclear Medicine, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India.

Abstract

Introduction:

In the present time, iodinated contrast agents are increasingly being used in the computed tomography (CT) component of positron-emission tomography (PET) study with the assumption that contrast-enhanced CT (CECT) will provide better diagnostic yield, although the utility of this procedure is still being debated. The aim of the study was to evaluate the effect of contrast CT on the diagnostic yield of PET-CT scan in patients with head-and-neck malignancies.

Materials and Methods:

In a prospective study, 204 patients (140 males and 64 females) of head-and-neck malignancies underwent contrast-enhanced and nonenhanced fluorodeoxyglucose (FDG)-PET-CT for various clinical indications following informed consent. After a plain CT scan, CECT was done using iodinated contrast iopromide-370 at a dose of 1 ml/kg intravenously. After CECT acquisition, FDG-PET acquisition was done and images were reconstructed to obtain whole-body PET/CT and PET-CECT images.

Results:

Both the modalities could detect similar number of primary lesions (n = 127), lymph nodal lesions (n = 118), and metastatic involvement (n = 55) with no significant difference between SUVmax. However, conspicuity of primary tumors and lymph nodal architecture was significantly better delineated with CECT, leading to better interpreter confidence.

Conclusion:

CECT data as part of the combined PET-CT examination provide precise anatomic localization and delineation of the primary tumor in comparison to nonenhanced PET-CT. However, no significant diagnostic changes are noted in the nodal and metastatic staging.

KEYWORDS:

Head-and-neck malignancy; iodinated contrast; positron-emission tomography

Supplemental Content

Full text links

Icon for Medknow Publications and Media Pvt Ltd Icon for PubMed Central
Loading ...
Support Center