CT of the Pancreas: Comparison of Anatomic Structure Depiction, Image Quality, and Radiation Exposure between 320-Detector Volumetric Images and 64-Detector Helical Images

Abstract

Purpose:To prospectively compare 320-detector volumetric and 64-detector helical computed tomographic (CT) images of the pancreas for depiction of anatomic structures, image noise, and radiation exposure. Materials and Methods:This study was approved by the institutional review board, and written informed consent was obtained. A total of 154 patients (85 men, 69 women; age range, 26-85 years; mean age, 67 years) who underwent biphasic (arterial and pancreatic phase) contrast material-enhanced CT performed with a 320-detector scanner were randomized into two groups: the 320-detector group and the 64-detector group. Biphasic transaxial multiplanar reformatted images and volume-rendered CT angiograms were obtained. CT numbers in the abdominal aorta, pancreas, and abdominal wall fat tissue; signal-to-noise ratio (SNR); and dose-length product (DLP) were compared. In addition, image quality and focal lesion depiction ( n = 35) were qualitatively determined in the two groups. Unpaired t and Mann-Whitney tests were used for quantitative and qualitative assessment, respectively. Results:No signifi cant difference in CT numbers of the abdominal aorta and pancreas was noted between the two groups. Mean DLP was 43% lower in the 320-detector group (675.4 mGy·cm) than in the 64-detector group (1187.8 mGy·cm) ( P , .001 ). SNR of the abdominal aorta, pancreas, and abdominal wall fat on biphasic images was signifi cantly lower in the 320-detector group than in the 64-detector group ( P , .001). Image quality was acceptable in both groups and was slightly better in the 64-detector group for pancreatic phase axial images ( P = .02) and arterial phase multiplanar reformatted images ( P , .01). No signifi cant difference was found in the depiction of pancreatic parenchyma, main pancreatic duct, focal pancreatic lesions, splanchnic arteries, or most of the small splanchnic arterial branches. Conclusion:A 320-detector CT scan facilitates fast volumetric contrastenhanced CT of the entire pancreas with acceptable image quality, even though SNR was signifi cantly lower at 320-detector volumetric scanning.q RSNA, 2011 1

Comparison of pancreatic volume and fat amount linked with glucose homeostasis between healthy Caucasians and Koreans

“…Two different approaches were applied to evaluate pancreatic fat deposit complementarily, and the techniques described in the present study now facilitate similar studies. This study also supports and extends previous work on quantitative and qualitative assessment of the pancreas using MDCT with high spatial accuracy and fine resolution …”

“…This study also supports and extends previous work on quantitative and qualitative assessment of the pancreas using MDCT with high spatial accuracy and fine resolution. 49 In conclusion, the present study showed that, compared with white participants, Korean participants had a significantly lower pancreatic volume and tended to have greater fat content in the pancreas, and these factors were associated with the disposition index, a dynamic marker reflecting insulin secretory function for insulin resistance. These disadvantageous constitutional features in the pancreas might make Koreans, and possibly other Asians, more vulnerable to pancreatic β-cell damage even though they might have slightly less insulin resistance than white people, who might be protected against the same degree of insulin resistance with a relatively larger β-cell reservoir.…”

MDCT of Chest, Abdomen, and Pelvis Using Attenuation-Based Automated Tube Voltage Selection in Combination With Iterative Reconstruction: An Intrapatient Study of Radiation Dose and Image Quality

“…For the subcutaneous fat of the anterior abdominal wall, the constant position was set at the level of the aortic bifurcation [30,31]. Aortic attenuation was measured at the level of the origin of the right renal artery.…”

Comparative Analysis Image Results of Pancreas in Portal Vein Phase on Ct Scan Abdomen Contrast Without and With Minimum Intensity Projection in Ct Scan 64 Slice

“…Jika hasil evaluasi kedua responden dihitung maka kesimpulan yang diperoleh ada perbedaan yang signifikan antara hasil citra pankreas fase vena porta pada CT Scan abdomen kontras tanpa dan dengan reformat MinIP. Butir pertanyaan yang digunakan selain telah diuji dengan menggunakan uji korelasi Spearman Rank yang menunjukan ada hubungan antara pertanyaan satu dan lainnya, butir pertanyaan juga mengacu pada jurnal yang ditulis oleh (Goshima, 2011) yang mengatakan bahwa dengan modalitas CT Scan 64 slice dapat membedakan struktur anatomi pankreas dan organ-organ disekitar arteri splenica, arteri celiaca, duodenum, vena mesenterika superior dan arteri pancreaticodudenal dengan baik. Namun penelitian yang dilakukan ini tanpa menggunakan reformat MinIP.…”