Diagnostic and Interventional Radiology
Abdominal Imaging - Original Article

Correlation of minimum apparent diffusion coefficient with maximum standardized uptake on fluorodeoxyglucose PET-CT in patients with rectal adenocarcinoma


From the Departments of Radiology Nuclear Medicine and General Surgery Ankara University School of Medicine, Ankara, Turkey.


Departments of Radiology, Ankara University School of Medicine, Ankara, Turkey

Diagn Interv Radiol 2014; 20: 105-109
DOI: 10.5152/dir.2013.13275
Read: 747 Downloads: 490 Published: 03 September 2019


The aim of this study was to retrospectively assess the correlation between minimum apparent diffusion coefficient (ADCmin) values obtained from diffusion-weighted magnetic resonance imaging (MRI) and maximum standardized uptake values (SUVmax) obtained from positron emission tomography-computed tomography (PET-CT) in rectal cancer. 

Forty-one patients with pathologically confirmed rectal adenocarcinoma were included in this study. For preoperative staging, PET-CT and pelvic MRI with diffusion-weighted imaging were performed within one week (mean time interval, 3±1 day). For ADC measurements, the region of interest (ROI) was manually drawn along the border of each hyperintense tumor on b=1000 s/mm2 images. After repeating this procedure on each consecutive tumor-containing slice to cover the entire tumoral area, ROIs were copied to ADC maps. ADCmin was determined as the lowest ADC value among all ROIs in each tumor. For SUVmax measurements, whole-body images were assessed visually on transaxial, sagittal, and coronal images. ROIs were determined from the lesions observed on each slice, and SUVmax values were calculated automatically. The mean values of ADCmin and SUVmax were compared using Spearman’s test. 

The mean ADCmin was 0.62±0.19×10-3 mm2/s (range, 0.368–1.227×10-3 mm2/s), the mean SUVmax was 20.07±9.3 (range, 4.3–49.5). A significant negative correlation was found between ADCmin and SUVmax (r=-0.347; P = 0.026). 

There was a significant negative correlation between the ADCmin and SUVmax values in rectal adenocarcinomas.

EISSN 1305-3612