your smartphone

your smartphone

M. Hirata1, R. Watanabe2

Matsuyama Shimin Hospital, 1Radiology, 2Surgery Matsuyama Ehime/JP

We have no disclosure and financial support.

Abstract ID 69730 -

1. How to use “Smart Puncture”, which is a free application to make

your gyroscope equipped smartphone into beneficial tool for CT-

guided puncture.

2. The advantages of this application.

To overcome this,

we developed a smartphone application to assist CT-guided puncture.

• In CT-guided puncture, with traditional step-wise approach (non-use of CT fluoroscope),

physician has to define the angle of puncture needle by eye measurement as planned

on the reference images.

• This process depends on the physician’s sense. It can be a cause of inaccurate

puncture with large angle error.

Function of the Application

“Smart Puncture” for iOS and Android.

You can move the rotation center by tapping on

the display. It also can be locked if necessary.

Available for free

After setting puncture angle, the smartphone

displays a guideline.

While holding it at any angle, it automatically

rotates the guideline to maintain appropriate

angle.

movie

movie

Function of the Application

It also detects the tilt of the smart phone, and

change the color of the background.

movie

movie

CT scan with radiopaque marker.

Definition of needle angle and entry site.

Mark the entry site and beam line.

Turn on Airplane mode.

Turn off Auto-Lock

Put the smartphone into

sterilized nylon bag

Input the angle(α) into the smartphone

Hold the smartphone along the beam line.

Adjust the tilt of device to make the background black.

Move center of guideline to suitable position and lock.

Finally, just advance the needle along the guideline

shown on the device.

Measure the

Puncture angle on

CT console.

A piece

of cake!

Smartphone

Sixty-seven years old man with sacral bone tumor.

CT guided bone biopsy was done using this application.

Planed puncture angle was defined as 23°.

Finally, biopsy needle was placed at 22°.

23°

22°

After putting the smartphone into a nylon bag,

you can hold it more easily.

movie

This application also works on tablet.

If assistant holds it nearby the workspace,

the physician can concentrate on needle

operation.

CT scan

3. After puncture, the target was scanned by CT.

Then angle Error was evaluated on a workstation.

In order to evaluate the accuracy of this application,

experimental puncture test was carried out.

1. A puncture target was made from melamine sponge.

2. For simulating the procedure without gantry tilt, punctures was carried out using this

application with angles setting of 30 50 70 degrees in a vertical plane

For simulating the procedure with gantry tilt, punctures were done in the same manner

in tilted plane of 15, 30, 45 degrees.

0° 15°

30°

45°

30°

50°

70°

Set angle 30° 50° 70°

Angle Error (XY) 1° 0° 0°

Set angle 30° 50° 70°


Angle Error (Z) 1° 1° 1°

Set angle 30° 50° 70°



Set angle 30° 50° 70°



The maximum angle error was 1° without gantry tilt.

The maximum angle error was 3° with gantry tilt. iPhone6 was used for this puncture test.

Tilt of LCD = 0°

Tilt of LCD = 15°

Tilt of LCD = 30°

Tilt of LCD = 45°

Most of smartphones have vibrating structure gyroscope inside, in order

to recognize the movement of the device itself. This application makes

your smartphone into a handy tool which present appropriate puncture

guideline in real time with high accuracy.

Advantages:

1. High availability of devices.

2. Easy preparation. (Just put the smartphone into sterilized nylon bag.)

3. Easy to complete procedure without assistant.

Type of sensor installed in device is nondisclosure.

Accuracy should be verified for each device in usage.

Accuracy should be verified.

We developed an application to support CT

guided puncture.

This application makes your smartphone into

beneficial tool for accurate puncture.

“Smart Puncture” for iOS and Android.

Available for free.

your smartphone

Documents

Transcript of your smartphone