The extent of unnecessary tooth loss due to extractions prior to radiotherapy based on radiation field and dose in patients with head and neck cancer.

Background And Purpose: Prior to radiotherapy (RT), teeth with poor prognosis that pose a risk for post-RT osteoradionecrosis (ORN) are removed. To allow enough time for adequate wound healing prior to RT, decisions are made based on the estimated radiation dose. This study aimed to gain insight into (1) the overall number of teeth extracted and (2) the patient and tumor characteristics associated with the number of redundantly extracted teeth.

Detection of Bone Marrow Edema in the Head and Neck With Dual-Energy CT: Ready for Clinical Use?

The aim of this study is to evaluate the ability of dual-energy CT (DECT) to identify bone marrow edema (BME) in the head and neck region in comparison with MRI as the standard of reference. A total of 33 patients who underwent imaging between February 2016 and February 2018 were included in this retrospective study. All patients underwent both DECT and MRI for head and neck abnormalities.

Dual-Energy CT in Head and Neck Imaging.

Purpose Of Review: To explain the technique of Dual-energy CT (DECT) and highlight its applications and advantages in head and neck radiology.

Recent Findings: Using DECT, additional datasets can be created next to conventional images. In head and neck radiology, three material decomposition algorithms can be used for improved lesion detection and delineation of the tumor.

Nutrient enrichment of white spruce seedlings during nursery culture and initial plantation establishment.

Growth and nutrient dynamics of bare-root white spruce (Picea glauca (Moench) Voss) seedlings were monitored for three years in a nursery and for one season after planting to assess effects of three nursery fertilization regimes. Nitrogen (totaling 0, 650, and 1300 kg N ha(-1) for 3 years) was applied conventionally in equal amounts during the growing season. The high-N treatment, representing a nutrient loading regime, was also applied seasonally at exponentially increasing rates as a fourth treatment.