Which motion is more likely to produce ghost artifacts in MRI?

Critical Thinking:How does reducing NEX affect scan time, and what impact does it have on image quality? Select all that apply:

In a gradient echo (GRE) sequence, stimulated echoes can be removed by using __________.

In 3D (volume) imaging, slices are separated by:

Critical Thinking:A sequence is set with a small voxel size, low NEX, and thin slices. What challenge might the image quality present?

Increasing the ETL in a TSE sequence results in:

Developing fly larvae (egg) express Hox genes that work in a similar manner to those in mammals.  Below is a diagram of the larvae Hox gene expression and phenotype.  Choose from the drop down menus to finish the sentence correctly based on the image provided.  3pts “A fly that has loss of function of Hox gene scr, would create a fly that has no [option1], but has an extra set of [option2] in position [option3].”

Spemann used his daughter’s hair to aide in his demonstration that the early newt embryo has an organizing center that is either conditionally or autonomously specified.  (4 pts) Explain how the first division had to occur before he separated the two-cell embryo into two individual cells to demonstrate conditional specification. Explain the molecular signaling that was discovered almost 40 years later to back up Spemann’s experiments that was discussed in class related to frogs.

Predicting results in an embryo (4 pts ) A) predict the phenotype at a specific stage of the organism for each experimental/mutant scenario. B) explain the reasoning that led you to your prediction.   A frog at neurulation that was soaked in a solution with Disheveled dominant negative mRNA since the two-cell stage..

Put the events in the order in which they occurred during development in flies. 1 = first, 5 = last.  (5 pts; 1pt/?)