November 2012


Radiation Exposure in Neuroradiology

AJNR Editor-in-ChiefMauricio Castillo

The issue of excess or unnecessary radiation exposure has been popular in the lay press and in scientific publications. On June 17, 2011, the New York Times published an article regarding patients who obtained unneeded double CT studies. One year earlier, that same venue published a piece … more »


The Use of Adaptive Statistical Iterative Reconstruction in Pediatric Head CT: A Feasibility Study

Gregory Vorona

Iterative reconstruction algorithms for CT, which have been made possible through recent advances in hardware capabilities and algorithm design, allow for significant radiation dose reductions with preservation of image quality. CT image reconstruction has traditionally utilized filtered back-projection, which operates on several limiting fundamental assumptions about scanner geometry. Iterative reconstruction techniques are more computationally intense, and involve a series of updates … more »

Patient Safety

Low Kilovoltage CT of the Neck with 70 kVp: Comparison with a Standard Protocol

Hatem Alkadhi

We chose this topic because of our interest in lowering radiation doses from CT. Our machine was recently equipped with a tube that is able to switch down to 70 kVp. In addition, we noted that the tube potential selection software automatically chose a tube potential of 70 kVp when scanning the neck in some patients. After careful evaluation of these images, … more »

Patient Safety

Radiation Dose Reduction in Temporal Bone CT with Iterative Reconstruction Technique

Zhenchang Wang

Iterative Reconstruction Technique (IRT) is a new CT reconstruction algorithm, and there have been many reports on the use of it to improve image quality and dose reduction in CT. The temporal bone has fine anatomic structures that demand higher spatial resolution than most other clinical targets. We chose this topic because, to our knowledge, no study to date had investigated … more »

Patient Safety

Lowering the Dose in Head CT Using Adaptive Statistical Iterative Reconstruction

Koray Kilic

Radiation dose in diagnostic work-up has always been an important topic in our radiology department as well as in other radiology societies.  We make every effort to decrease the dose imparted to patients by using bismuth shields, automatic tube current modulation, low-kVp methods for CT angiography, low-dose examinations where applicable (urinary stone, paranasal sinuses, pulmonary nodule follow-up etc), stratified dose protocols … more »

Patient Safety

A Comparison of Radiation Exposure between Diagnostic CTA and DSA Examinations of Cerebral and Cervicocerebral Vessels

Anna-Leena Manninen

The number of CTA examinations is continually increasing compared with DSA examinations, because of the development of multisection CTA techniques. The effective dose is a useful tool for comparison of radiation exposure of different imaging techniques. The radiation exposure must be kept as low as reasonably achievable (ALARA principle) for the avoidance of radiation-related risks. The challenge is that CTA and DSA … more »

Patient Safety

Cranial CT with Adaptive Statistical Iterative Reconstruction: Improved Image Quality with Concomitant Radiation Dose Reduction

Otto Rapalino

CT radiation exposure has progressively increased in the last few years because of the wide availability of CT scanners and the increasingly important role of CT imaging as a noninvasive diagnostic technique. Iterative reconstruction techniques offer the possibility of improving contrast resolution while reducing radiation exposure. The clinical availability of iterative reconstruction methods in CT scanners was made possible by technical improvements in … more »

Special Collections

Vascular Lesions of the Head and Neck

Guilherme Dabus

“Vascular Lesions of the Head and Neck” is the latest Special Collection from the American Journal of Neuroradiology. Collection Editor Guilherme Dabus from the Miami Vascular Institute organized 39 articles into 4 sections to provide a panoramic view of these lesions from the diagnostic and therapeutic perspectives. The major sections are: Vascular Anomalies, including hemangioma and high- and low-flow vascular malformations; … more »