Biomedical Engineering Blog

Biomedical Engineering

The Biomedical Engineering blog is the place for conversation and discussion about topics related to engineering principles of the medical field. Here, you'll find everything from discussions about emerging medical technologies to advances in medical research. The blog's owner, Chelsey H, is a graduate of Rensselaer Polytechnic Institute (RPI) with a degree in Biomedical Engineering.

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Reading the Human Heart - Part 1

Posted July 24, 2007 4:50 PM by Steve Melito

If you could read another's heart, what would you want to know? For cardiologists, new imaging technologies provide a way to detect and diagnose heart problems sooner than later. The Biograph TruePoint PET∙CT, as described in Breast Cancer: Looking from the Outside In, is one such bio-imaging system from Siemens Medical Solutions. Simply, the Siemens Biograph offers incredible resolution and quality in order to improve a patient's treatment options. Along with the oncologists who use the Biograph TruePoint PET∙CT, cardiologists can use the device with a PET∙CT Cardiology Engine allowing them to implement a streamlined cardiology workflow.

Biograph Breakdown

It's Biograph breakdown time! How do imaging devices such as the PET CT improve cardiac diagnostics? For starters, features such as the LSO HI-REZ PET offer a 250% improvement in volumetric resolution of scans. Simply put, this gives doctors a better opportunity to detect tiny lesions that were once undetectable. By using a higher light output, the LSO enables the formation of truly tiny detector crystals. The smaller the crystal size, the greater the number of crystals. This finer spatial resolution permits the creation of more image planes, which in turn allows for smaller sampling and enhanced lesion detection.

LSO HI-REZ PET is just one of the Siemens Biograph's defining characteristics. From Pico-3D to True C to 3D Imaging, the Biograph's features and workflow solutions can literally change PET CT imaging. The following chart summarizes these features and provides both descriptions and benefits.

Features: Description & Benefits

Pico 3D Electronics

-greater energy and time resolution

-faster processing

-better randoms rejection

-better image quality

-increased count rate by 70% gain

-higher quality of 3D imaging allowing for a cut in the given doses

True C

-scatter correction

-allows greater analysis which allows for a better assessment

True X

-uses measured point spread functions to reconstruct and create the PET images

-high resolution and superior contrast

True V

-wide axial field

-greater NECR

-larger number of detector elements and detector rings

-field widened 33% increasing count rate performance by 78%

-allows doses or scan times to be cut in half

3D Imaging

-no shielding used

-acceptance angle maximized

-correction in detected scatter & random events

-increase in system sensitivity

-allows flexibility in dosage and timing

-highest image quality and accuracy

AC Plus

-provides a larger transverse field of view CT image, this is for the attenuation correction

-provides images of patient anatomy outside of the normal 50 cm area

-most accurate attenuation correction

Ultra Fast Ceramic Detector

-has a faster decay reaction that allows the measurement of more incoming photons per unit of time

-uses x-ray absorption, high light output and short afterglow properties

-helps to improve the image quality

-allows fast rotation times in the CT without an increase in image noise


-spiral scan

-lower current levels

-allows more patient coverage

-allows for up to a 20% reduction in doses


-gives a real-time dose modulation by computing features that rely on the body shape of the patient

-reduces the dose depending on the circumstances

-up to 66% reduction in dosage

-decrease in power consumption & heat load

-larger ranges and allows for flexibility w/multiphase exams


-user interface

-the base for the MI Acquisition Workplace

-allows for coronal, saggital, MIP, and oblique planes to be formed from raw data

-doubles the processing power

-frees up the system for scanning


-provides two views for each CT scan while being aligned with the system to measure 4,260 projections a second

-improves resolution by providing less than .4 mm resolution for all scan modes


Demo link


Siemens biograph info site,1007660,1004808,1004804,1004806,1004807,14255~a_langId~e_-11~a_productId~e_143899~a_storeId~e_10001.htm


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Re: Reading the Human Heart - Part 1

07/25/2007 4:34 AM

That was a long read. Okay, I confess, I didn't read all of it .

I was a little interested because I have a congenital heart condition called "Premature Ventricular Contraction" or PVC. My hearbeat is quite irregular but it's never bothered me. In fact, I only knew about it when I was hospitalized for food poisoning in my teens. The emergency room doc turned pale when she listened to my heart. She immediately called the resident cardiologist. When my mom arrived at the hospital, she told them of my condition. That was the first time I learned about it.

The bad news (in addition) was that my condition was incurable. 'Only way to fix it was to have a transplant. However, since it wasn't bothering me and I've been going through a normal childhood and teenhood without knowing it, the doc told my mom to let it be.

Over the years, I've consulted other doctors about it but there have been no development.

Miscommunication: when what people heard you say differs from what you said. Make yourself understood.
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