Comprehensive Patient-Specific Intensity-Modulated Radiation Therapy Quality Assurance Comparing Mobius3D/FX to Conventional Methods of Evaluation.

Purpose To determine the appropriateness of implementing Mobius3D/FX (Varian Medical Systems, Inc., Palo Alto, CA, USA) as not only a pretreatment secondary check but as an alternative to measurement-based patient-specific intensity-modulated radiation therapy (IMRT) quality assurance (QA). Methods Mobius3D/FX was commissioned and stock beam models were tweaked so that an independent recalculated 3D dose distribution can be obtained.

Timing matters: length of leave and working mothers' daily reentry regrets.

Dealing with developmental tasks in work and family domains is an important challenge for young and middle-aged adults. We investigated a transition that has evolved into a normative task for women, namely, the retransition back to paid work following maternity leave. In a diary study with 149 mothers who had just returned to work, we examined the daily experienced regrets concerning this return.

A 32-channel lattice transmission line array for parallel transmit and receive MRI at 7 tesla.

Transmit and receive RF coil arrays have proven to be particularly beneficial for ultra-high-field MR. Transmit coil arrays enable such techniques as B(1) (+) shimming to substantially improve transmit B(1) homogeneity compared to conventional volume coil designs, and receive coil arrays offer enhanced parallel imaging performance and SNR. Concentric coil arrangements hold promise for developing transceiver arrays incorporating large numbers of coil elements.

Midlife crisis: a debate.

Without doubt, the midlife crisis is the most popular concept describing middle adulthood. Facing the limitation of the time until death, men in particular are believed to pause from actively pursuing their goals and review their achievements, take stock of what they have and have not yet accomplished, at times taking drastic measures to fulfill their dreams. This paper critically discusses the concept of a midlife crisis and the relevant empirical evidence, presenting arguments for and against a strict, a moderate, and a lenient conceptualization of the midlife crisis.

A geometrically adjustable 16-channel transmit/receive transmission line array for improved RF efficiency and parallel imaging performance at 7 Tesla.

A novel geometrically adjustable transceiver array system is presented. A key feature of the geometrically adjustable array was the introduction of decoupling capacitors that allow for automatic change in capacitance dependent on neighboring resonant element distance. The 16-element head array version of such an adjustable coil based on transmission line technology was compared to fixed geometry transmission line arrays (TLAs) of various sizes at 7T.

B(1) destructive interferences and spatial phase patterns at 7 T with a head transceiver array coil.

RF behavior in the human head becomes complex at ultrahigh magnetic fields. A bright center and a weak periphery are observed in images obtained with volume coils, while surface coils provide strong signal in the periphery. Intensity patterns reported with volume coils are often loosely referred to as "dielectric resonances," while modeling studies ascribe them to superposition of traveling waves greatly dampened in lossy brain tissues, raising questions regarding the usage of this term.