Localization and quantification of the delivered dose to the spinal cord. Predicting actual delivered dose during daily MVCT image-guided tomotherapy.

Purpose: The goal of the present work was to localize and quantify the actual delivered dose to the cervical spinal cord (SC) during head and neck cancer (H&N) treatment.

Materials And Methods: A total of 20 H&N patients treated with bilateral nodal irradiation with helical tomotherapy (HT) were analyzed. Daily MVCTs were performed for image guidance.

Do we need daily image-guided radiotherapy by megavoltage computed tomography in head and neck helical tomotherapy? The actual delivered dose to the spinal cord.

Purpose: To quantify the actual delivered dose to the cervical spinal cord with different image-guided radiotherapy (IGRT) approaches during head and neck (HN) cancer helical tomotherapy.

Methods And Materials: Twenty HN patients (HNpts) treated with bilateral nodal irradiation were analyzed. Daily megavoltage computed tomography MVCT) scans were performed for setup purposes.

Behavior of sex chromosomes during meiosis in the house shrew.

The behavior of the sex chromosomes during meiosis in the house shrew, Suncus murinus, shows some interesting features. Both X- and Y-chromosomes are large and biarmed and have huge segments of C-band material in noncentromeric areas. A distinct chiasma is formed between the short arms of the X and Y chromosomes and the heterochromatic regions in the bivalents show desynapsis in the form of a bulge.

Karyological analysis of the Horsfield's shrew from peninsular India.

The chromosome complement of the Horsfield's shrew, Crocidura horsfieldi (Soricidae--Insectivora) was studied and the diploid number established to be 2n = 38. Comparisons were made with other species of the genera.

Chromosomes and meiosis in two species of Dermaptera.

The chromosome cytology of two species of Dermaptera, namely Diplatys gladiator and Forficula sp., has been studied. The diploid number of chromosomes in male Diplatys gladiator is 18 (16AA + XY), whereas in male Forficula sp.